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Doctor insights on: 12 Weeks 6 Days Pregnant Ultrasound

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How accurate are ultrasounds at 12 weeks. Is it possible to be twelve weeks pregnant and bby measure at 14 weeks?

How accurate are ultrasounds at 12 weeks. Is it possible to be twelve weeks pregnant and bby measure at 14 weeks?

Very: A technically good scan by a proficient sonographer or physician will be accurate to less than 1 week in the first trimester. If a 12-week scan is technically good and is interpreted correctly, it should not be possible to be off by that much; meaning the ultrasound dates are likely correct. ...Read more

Dr. Michael Gabor
2,275 doctors shared insights

Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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I am 12 weeks and 4 days pregnant and having really bad sharp pains been crying all night. Need some advice I have an ultra sound tomorrow.

I am 12 weeks and 4 days pregnant and having really bad sharp pains been crying all night. Need some advice I have an ultra sound tomorrow.

It may be UR baby's: Kicking or movement patterns. Depending on where your sharp pains are coming from makes a difference on what it could be. Since you are getting your us tomorrow, this will be visible. Go with the recommendations of your ob/gyn for otc pain meds you can take now, or calming herbal teas, so you can rest well now. Crying is normal, as your hormone levels are high, and it may make you more emotional. ...Read more

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With a normal pregnancy, all ultrasounds including ones in the 1st trimester showed LMP 10/15/12. Could conception have occurred after 11/7/12?

With a normal pregnancy, all ultrasounds including ones in the 1st trimester showed LMP 10/15/12. Could conception have occurred after 11/7/12?

Pregnancy sono: If the ultrasounds were done in the first trimester and all confirm the 10/15/12 lmp, then there is little chance that conception occurred after 11/7/12. The first trimester ultrasound is usually sensitive to +/- 3 days. ...Read more

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When 1st trimester ultrasounds date pregnancy how do they base the gestational age? Do they assume conception occured on cd14?

When 1st trimester ultrasounds date pregnancy how do they base the gestational age? Do they assume conception occured on cd14?

US: First trimester ultrasound is based on biometric measurements only, the embryonic crown-rump length, which is extremely reliable when done by a skilled sonographer. No assumptiosn need be made at all. The ega is however reported correctly, by convention, from the first day of a hypotehtical last menstrual period; so in that regard it 'assumes' conception on cd 14. ...Read more

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I was worried I was pregnant so paid for external ultra sound at what would be 12 weeks. No baby found... Could I still be pregnant?

I was worried I was pregnant so paid for external ultra sound at what would be 12 weeks. No baby found... Could I still be pregnant?

May be pregnant: Yes, but you may not be as far along as you thought. Your doctor can check hormone levels and then repeat an ultrasound in a few weeks to see if everything is OK. ...Read more

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Do the ultra sound add 2 weeks to determine a due date? It says I'm 12 weeks pregnant did i conieve 12 weeks ago?

Do the ultra sound add 2 weeks to determine a due date? It says I'm 12 weeks pregnant did i conieve 12 weeks ago?

Menstrual age vs ...: Gestational age. You need to know what someone means by 12 weeks pregnant — menstrual age or gestational age.

Before ultrasound, everything was based on number of weeks since the first day of the last menses. That is the menstrual age of the pregnancy.

Most women become pregnant 2 weeks after their last menses, which is the gestational age, or the actual time (weeks) since conception. ...Read more

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I'm 37 years old and 12 weeks pregnant, yesterday I went for a sonogram and the doctor ask me to retake. Should i be scared.

I'm 37 years old and 12 weeks pregnant, yesterday I went for a sonogram and the doctor ask me to retake. Should i be scared.

Discuss with doc: There can be many reasons to be called back. Maybe the technologist forgot to do a measurement. Maybe one of the measurements doesn't make sense. May be something needs to be confirmed. You could call and ask your doc or just go and talk with your doc after the second scan. ...Read more

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I'm 12 weeks pregnant. I had bleeding with vaginal and pelvic pain. I went to the ER and the ultra sound showed nothing wrong. But the doctor couldn't give me an answer. What should I do?

I'm 12 weeks pregnant. I had bleeding with vaginal and pelvic pain. I went to the ER and the ultra sound showed nothing wrong. But the doctor couldn't give me an answer. What should I do?

Possibilities...: Bleeding in the first trimester is not uncommon. At the 12-week point, it could be some bleeding coming from the placental implantation, as it is developing/burrowing into the endometrium, it could also be from some sensitive cells ('friable') on the cervix, — these conditions wouldn't be seen by sonogram. Most impt: if ur baby is growing, has nl heart rate, — a miscarriage is very unlikely. ...Read more

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My period is irregular. I had an ultrasound on 4-11-14, that showed I was 12 weeks 6 days, when did I conceive I didn't have a period in january?

My period is irregular. I had an ultrasound on 4-11-14, that showed I was 12 weeks 6 days, when did I conceive I didn't have a period in january?

Best guess: Is between january 23-28th, but 2nd-trimester us may be off as much as +/- 1 week, so can't say "for sure" any better than that. ...Read more

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Had NT ultrasound on nov.20 putting me at 12 weeks 4 days;crl of fetus was 6.2cm. What were possible dates of conception? And how accurate is all of this?

Had NT ultrasound on nov.20 putting me at 12 weeks 4 days;crl of fetus was 6.2cm. What were possible dates of conception? And how accurate is all of this?

Pretty Accurate: Estimated conception would be around sept. 9. This should be accurate to within less than a week. Relations could have taken place up to about 5 days before conception. Good luck. ...Read more

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I am 12 weeks 2 days pregnant. I have an appointment next Thurs (12/11) for NT testing and ultrasound. Will I be able to find out the sex? Thanks

I am 12 weeks 2 days pregnant. I have an appointment next Thurs (12/11) for NT testing and ultrasound. Will I be able to find out the sex? Thanks

Maybe: If baby is real cooperative and ultrasonographer is lucky you may be able to see, but that early it is hard. It is easier to see at 16-22 weeks. Have fun seeing your baby. ...Read more

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If u have an ultrasound at 12 weeks and it comes back saying u are 12 weeks + 4 days — is that enough of a difference to move up your due date?

If u have an ultrasound at 12 weeks and it comes back saying u are 12 weeks + 4 days — is that enough of a difference to move up your due date?

Depends: It depends on how much different there is from the due date calculated by the first day of the last period. If the difference is less than 7 days, we usually wouldn't change the due date. If more than 7 days, we usually would except in rare situations where we are 100% sure of the conception date. ...Read more

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At an ultrasound, what determines if you are 12 weeks or 12 weeks + 4 days? Are measurements this precise? And the accuracy correlates with your LMP too?

At an ultrasound, what determines if you are 12 weeks or 12 weeks + 4 days? Are measurements this precise?  And the accuracy correlates with your LMP too?

Crown Rump Length: At twelve week on ultrasound, the sonographer measures the fetus' crown rump length (crl). This measurement is from the base of skull to tailbone. Ultrasounds at twelve weeks are accurate within 7 days. If you were 12 weeks by LMP and 12 4/7 weeks by sono, you due date would stay consistent with your lmp. ...Read more

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Went for an ultrasound that measured my baby at 14 weeks 2 days the doctors told me they are using a due date which predicts I'm 12 weeks which is right?

Ultrasound dating: Your ultrasound dating should not be more than 1 week off from your due date at this point in your pregnancy. Assuming this was your first ultrasound you should talk with your doctor about whether she wants to change your due date. ...Read more

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How well is conception date accuracy with ultrasound at 12 weeks? My LMP started on nov.28, 2011 lasting five days. I had an ultrasound on jan.17, 2012 counting me at 7 weeks and 1 day, then another ultrasound on feb.21, 2012... Counting me at 12 weeks exa

How well is conception date accuracy with ultrasound at 12 weeks? My LMP started on nov.28, 2011 lasting five days. I had an ultrasound on jan.17, 2012 counting me at 7 weeks and 1 day, then another ultrasound on feb.21, 2012... Counting me at 12 weeks exa

The : The ultrasound dating now is remarkably accurate. There can be discrepancies in the dates that the patient has from the date of menstrual period, but the ultrasound dating is remarkably accurate based on the "crown rump length" of the fetus, which is the measurement of the baby from the crown of the head to the tip of its bottom, the development of the heart, and other vital organ which can already be identified by ultrasound dating. A 12-week ultrasound date should be very accurate. ...Read more

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If my ultrasound was on March 3, 2016, it said I was 6 weeks 3 days pregnant so now on April 15 I'm 12 weeks 4 days pregnant when did I Concieve?

If my ultrasound was on March 3, 2016, it said I was 6 weeks 3 days pregnant so now on April 15 I'm 12 weeks 4 days pregnant when did I Concieve?

Probably about 2-5: A follow up ultrasound performed this week by a skilled and certified sonographer can help confirm your gestational age and answer your question with greater accuracy. ...Read more

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I'm 10 weeks pregnant and have my NT ultrasound booked next week (11 weeks 3 days) should I put it back another week so that I'm at least 12 weeks?

I'm 10 weeks pregnant and have my NT ultrasound booked next week (11 weeks 3 days) should I put it back another week so that I'm at least 12 weeks?

Maybe : You're right on the border of when screening begins. I think it's okay at 11 weeks and three days, but consult with your doctor to make sure ...Read more

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I recently had a transvaginal ultrasound done & it said I'm 12 weeks & 5 days is it okay that the baby measures 11.3 cm? Is that too big or too small?

I recently had a transvaginal ultrasound done & it said I'm 12 weeks & 5 days is it okay that the baby measures 11.3 cm? Is that too big or too small?

Fine: The ultrasound dating of a pregnancy is based on the fetal measurements so, if the ultrasound dating agrees with your dating based on your last menstrual period, the baby is just the right size. Remember, however, that babies gain most of their weight in the third trimester and that is when you see the greatest difference between large and small babies. Best wishes to you both. ...Read more

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My periods are not regular has an ultrasound I was 12 weeks 2 days with a due date 1 28 2015 what day did sex get me pregnant?

My periods are not regular has an ultrasound I was 12 weeks 2 days with a due date 1 28 2015 what day did sex get me pregnant?

Date of conception: Based on the ultrasound due date, your date of conception was: May 7th, 2014. Also, based on ultrasound (and these can be a bit inaccurate), your last day of the last menstrual period was 4/23/14.

Hope this helps. ...Read more

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My doctor says that I'm only 12 weeks and 2 days pregnant, but my ultrasound said that I was 13 weeks and 1day. I know my periods are irregular, but I don't know with whomshould I go by?

My doctor says that I'm only 12 weeks and 2 days pregnant, but my ultrasound said that I was 13 weeks and 1day. I know my periods are irregular, but I don't know with whomshould I go by?

Irregular: If your periods are irregular go with the ultrasound, however these dates are 8 days between them and the margin of error of the study in the first trimester can be up to 10 days. ...Read more

Dr. John Landi
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more