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Doctor insights on: Pregnancy Wheel Calculator Gestational Age

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How accurate are clearblue digital pregnancy test with conception calculator?

How accurate are clearblue digital pregnancy test with conception calculator?

Positive test: They are accurate to determine if you are pregnant or not but not very accurate to give you the date of conception.

Dr. Milton Alvis Jr
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


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I had unprotected sex november 16, 2013 everytime I put that into a online pregnancy calculator under "date of conception" its says im 4 weeks. Why?

I had unprotected sex november 16, 2013 everytime I put that into a online pregnancy calculator under "date of conception" its says im 4 weeks. Why?

Easier calculation: Every pregnancy dating software is based on a 40 week pregnancy. Actually the pregnancy is not 40 weeks but 38 weeks. Not every women knows when they conceive but women know when their last menses occurs. Therefore the dating is from the last menses artificially adding 2 weeks to every pregnancy.

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Had sex on the 4th and my fertile days start till 6-11 acording to the fertility calculator. A condom was used is there any risk of pregnancy?

Had sex on the 4th and my fertile days start till 6-11 acording to the fertility calculator. A condom was used is there any risk of pregnancy?

Very unlikely: While it is technically possible to get pregnant on any day of the menstrual cycle, this is true because a person doesn't know when she ovulated. If your periods are regular, your fertility calculator should be quite accurate. Since you had sex, with contraception, outside of this time window your risk of pregnancy is very low, probably not more than 1%.

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10+-6days weeks pregnancy crl 3.9.Fhs 162.Growth of fetus is acc to gestational age. Is growth normal♥?

10+-6days weeks pregnancy crl 3.9.Fhs 162.Growth of fetus is acc to gestational age. Is growth normal♥?

Yes: If the report says the growth is accurate to gestational age then that is the same thing as saying that the fetal growth is normal.

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After the 6th or 7th week of pregnancy does the fetus double in size, causing the gestational age to be off?

After the 6th or 7th week of pregnancy does the fetus double in size, causing the gestational age to be off?

Early pregnancy: The rate of growth of the fetus in the first trimester is very rapid. An ultrasound in the first trimester has only a 3-6 day error while later in pregnancy that error grows to 3 weeks. The gestational age is more accurate in early pregnancy and less likely to be off in the first trimester.

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By the time a woman tests positive on a pregnancy test, is it safe to say that the gestational age at that time is approx 3-4 weeks?

By the time a woman tests positive on a pregnancy test, is it safe to say that the gestational age at that time is approx 3-4 weeks?

Yes: A blood pregnancy test usually turns positive just after 7 days after conception. This would be the 3rd gestational week.

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If last LMP is not known would a ultrasound measure sac in early pregnancy to match gestational age?

If last LMP is not known would a ultrasound measure sac in early pregnancy to match gestational age?

Yes: An early transvaginal ultrasound can accurately estimate the gestational age within a couple of days. In the first trimester, there is very little biologic variation in size. If the embryo is present, the "crown-rump length" is routinely measured and used to determine the gestational age. Also, the mean diameter of the gestational sac gives a reasonable estimate of age.

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What individual fetal measurement holds accuracy (represents true gestational age) longest in pregnancy (fl, ac, bpd, hc)?

What individual fetal measurement holds accuracy (represents true gestational age) longest in pregnancy (fl, ac, bpd, hc)?

Must use averages: I don't believe that any single measurement is most accurate throughout pregnancy. It is usually the averages that are taken. The most accurate measurements are actually in the first trimester in the way of the crown rump length in terms of predicting the estimated date of delivery.

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Can sperm live longer than a week inside a woman? Also can pregnancy ultrasounds be off by a whole 2 months for calculating gestational age?

Can sperm live longer than a week inside a woman? Also can pregnancy ultrasounds be off by a whole 2 months for calculating gestational age?

Here are some. ..: Available info confirmed sperms inside genital tract may survive up to 5 days inside female genital tract. So, do HPT in a wk after missing period & repeat it in a wk if the 1st test is (-) & still in doubt. As to gestational age, ask your ob-gyn doctor who would most be qualified to answer your individual question since she/he know more about you than anyone online. Best wish. ..

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Placenta is fundal grade 2. Gestational age 35 weeks. Is this right for this stage of pregnancy?

Placenta is fundal grade 2. Gestational age 35 weeks. Is this right for this stage of pregnancy?

Staging: Grade 2 means some early aging of the placenta, which is more common in women with hypertension and especially with smoking in pregnancy. It is also more common in advanced maternal age. If concerned, talk to your OB about NSTs and maybe a 39 week induction. If you're a smoker, stop ASAP

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Can the first 2 ultrasounds of pregnancy taken a month apart with the same accuracy of gestational age in the second trimester be off by +- 25 days?

Can the first 2 ultrasounds of pregnancy taken a month apart with the same accuracy of gestational age in the second trimester be off by +- 25 days?

Ultrasound: The earlier an ultrasound is done the more accurate it is. The due date should never be changed to the date received on a later ultrasound.

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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.

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What is a normal cervical length at 33 weeks of pregnancy? What should the bpd, ac, hc, fl of fetus be at this gestational age?

Cervix length: Should be more than 2.5 cm, as far as the rest your OB should be able to go over all of that with you as there is a range of normal.

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I'm perfectly sure I'm 4w2d pregnant (gestational age). My hCG level is 690. Is it too high? Could it be twin pregnancy?

I'm perfectly sure I'm 4w2d pregnant (gestational age). My hCG level is 690. Is it too high? Could it be twin pregnancy?

HCG: Twins are always possible. The HCG number may be inaccurate in terms of dating. The best way to be sure, or to diagnose twinning is to have an ultrasound.

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The crl & mean sac diameter measured during 7th wk of pregnancy gives fetal age:age from conception/implantation or the gestational age:age from lmp?

The crl & mean sac diameter measured during 7th wk of pregnancy gives fetal age:age from conception/implantation or the gestational age:age from lmp?

Lmp: All pregnancy dating is based on lmp. So even when lmp is unknown the age given by crl assumes when lmp "should have been. Ie about two weeks prior to implantation. So a pregnancy is 40 weeks from lmp and 38 weeks from implantation. All studies, all research, all dating, dating by ultrasound goes by the 40 week designation or from time of lmp.

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When calculating the gestational age in IVF pregnancy, should we calculate from LMP or from day of embryo transfer?

When calculating the gestational age in IVF pregnancy, should we calculate from LMP or from day of embryo transfer?

Neither: The transferred embryo is already developed to a certain stage which your IVF facility can tell you. Your LMP is very inexact and is just a guideline in non-IVF pregnancies. The date of conception is actually around day 14 of your cycle in a natural cycle and prior to the date of transfer in IVF.

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I am 29 & this my 2nd pregnancy. The first one was ectopic. The sonographic report says anteverted uterus bulky. Gestational age 4.5 weeks. Worry?

I am 29 & this my 2nd pregnancy. The first one was ectopic. The sonographic report says anteverted uterus bulky. Gestational age 4.5 weeks. Worry?

Diagnosing ectopic: That ultrasound report is not very helpful. It's usually impossible to see a gestational sac at 4.5 weeks. Making the diagnosis of ectopic may require serial blood tests to watch the HCG hormone levels rise, and repeat ultrasounds. As a guideline, when your HCG level reaches about 1200, you should be able to see a tiny gestational sac in the uterus. Good luck!