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Doctor insights on: Uterus Measuring Large For Gestational Age First Trimester

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Uterus (Definition)

The uterus is a muscular organ in a woman's pelvis where the the fertilized egg attaches ...Read more


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My uterus is dropping in the first trimester. Is this normal?

My uterus is dropping in the first trimester. Is this normal?

Not sure: Not sure what you mean by dropping. Certainly, your uterus will enlarge and feel like it is lower in your pelvis causing pressure ...Read more

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Is taking amoxicillin in the first trimester (9 weeks gestational age) safe?

Is taking amoxicillin in the first trimester (9 weeks gestational age) safe?

Yes: It is a safe antibiotic for pregnant women. Studies have shown no known fetal harm based on animal testing 10x the human dose. ...Read more

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Can a first trimester ultrasound gestational age/edd be wrong by 7 weeks?

Can a first trimester ultrasound gestational age/edd be wrong by 7 weeks?

No: First trimester ultrasounds are the most accurate for estimating gestational age within +/- 7 days. ...Read more

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Would the gestational age of 12wks+4days @62mm be off by 1 week since ultrasounds have a margin of error of 1 week in the first trimester?

Estimates: Determination of gestational age is based on estimates determined by the last menstrual period and ultrasound. There is a margin of error with ultrasound, but that does not mean that the gestational age is necessarily different by a week. It means that the ultrasound estimate is 12w4d with a very high likelihood that the actual age is between 11+ to 13+ weeks. ...Read more

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Can conception range be over a week off if gestational age is confirmed by early first trimester ultrasound?

Can conception range be over a week off if gestational age is confirmed by early first trimester ultrasound?

Yes: In general, ultrasound established dates should take precedence over menstrual dates if the discrepancy is greater than 7 days if done in the first trimester (first 12 weeks) and more than 10 days if done in the second trimester. ...Read more

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Can first trimester dating ultrasounds be a month off gestational age? (if taken at 8 weeks) could I have been 13 weeks and they measured 8?

Can first trimester dating ultrasounds be a month off gestational age? (if taken at 8 weeks) could I have been 13 weeks and they measured 8?

Unlikely: Ultrasound dating is very accurate when done around 8-11 weeks of gestation. But, as always, life is not perfect and mistakes can happen. A woman should be able remember what she was doing 6 weeks ago (around the time of conception) if the u/s scan is showing 8 weeks gestation. ...Read more

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Bleeding during first trimester slightly irregular gestational sac 17mm fluid collection beside gestational sac free fluid in cervix baby hr 167?

Bleeding during first trimester slightly irregular gestational sac 17mm fluid collection beside gestational sac free fluid in cervix baby hr 167?

Threaten miscarriage: You need to wait it out and have another ultrasound in a few days. This is a threatened miscarriage. The fht is good. ...Read more

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If u have gestational diabetes at what point would your baby start to grow larger than average? Could it be larger in the 1st trimester or later on?

If u have gestational diabetes at what point would your baby start to grow larger than average? Could it be larger in the 1st trimester or later on?

Typically later: Gestational diabetes by its very nature is a condition that develops later in pregnancy. It has to do with Insulin resistance caused by the hormones from the placenta. This would not impact a pregnancy in the first trimester. You would expect to see growth issues in the second or third trimesters. ...Read more

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How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?

How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?

Accurate!: 1st trimester ultrasounds are very accurate - have correlated with timed ivf pregnancies.
We usually consider 1st trimester scans accurate within 5-7days' 2nd trimester scans within 10-14days. ...Read more

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Can 1st trimester u/s be off 3 weeks in gestational age and in conception? (1st trimester) even if they have been pretty consistent in the pregnany

Can 1st trimester u/s be off 3 weeks in gestational age and in conception? (1st trimester) even if they have been pretty consistent in the pregnany

Not usually: Generally, the best ultrasound for dating is an early first trimester ultrasound. It is unlikely to be off by that much from where the actual pregnancy dates are, but it might be off from your menstrually calculated due date due to issues with when your last period was. ...Read more

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How big can the uterus grow for women pregnant on the first trimester?

Depends how big: It starts. If you have a normal size uterus it will be just at the level of the pubic bone at 12 weeks. ...Read more

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If accuracy of scans r supposed to be excellent in 1st trimester, particularly at 8-10 weeks gestation, then why is there an error margin of +/- 7dys?

If accuracy of scans r supposed to be excellent in 1st trimester, particularly at 8-10 weeks gestation, then why is there an error margin of +/- 7dys?

Math: There is a margin of error in everything is life. In sonography the margin exists because of the mathematics involved in measuring a fetus and then applying those measurement to standardized algorithms that establish the gestational age. The further along the wider the margin or error as one fetus begins to individualize. ...Read more

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How accurate are ultrasounds in the first trimester I'm due may 14 and the baby measuring 3.1 cm. So should I be futher along?

Very accurate: 1st trimester ultrasounds are the most accurate ultrasounds for dating a pregnancy. At 3.1cm today, your 10 weeks along and a due date of 5/14 is within accuracy. If you're not exactly 10 weeks today, then this information not helpful. You need date of ultrasound, gestational age on that date, and edc, as well as crl. ...Read more

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Dated 12 weeks 4 days on 7th Aug (first trimester), no lmp, how accurate is CRL? And is this age from conception?

Dated 12 weeks 4 days on 7th Aug (first trimester), no lmp, how accurate is CRL? And is this age from conception?

Very accurate: Determining gestational age by crown rump length during the first trimester of pregnancy is very accurate. The determined gestational age pretends that there was a menstrual period that started in this case 12 weeks plus 4 days before the day of the ultrasound. Conception would have been about 2 weeks after this assumed first day of LMP. ...Read more

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Is it ok to give into cravings in the first trimester? I feel so big and haven't had energy to workout.

Is it ok to give into cravings in the first trimester? I feel so big and haven't had energy to workout.

In a pickle?: If your cravings are confined to things like pickles and not very unhealthy foods-go for it. If you develop gestational diabetes, pregnancy induced hypertension discuss this with your treating OB MD first. ...Read more

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When are growth restrictions/larger than normal fetuses diagnosed? Ever in the first trimester?

When are growth restrictions/larger than normal fetuses diagnosed? Ever in the first trimester?

Fetal growth: Growth is measured by the four main ultrasound parameters: head circumference, biparietal diameter, abdominal circumference, and femur length. These measurements cannot be done until at least the second trimester. Lagging growth or overgrowth is not typically measured until even later in the pregnancy. ...Read more