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If you know when you conceived you should always go by your date. Ultrasounds, especially later in pregnancy, are not as accurate. Here are the dates that they can be off.

The inaccuracy of ultrasound

First trimester: 7 days

14 - 20 weeks: 10 days

21 - 30 weeks: 14 days

31 - 42 weeks: 21 days

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Q: If an ultrasound says you are 25 weeks 4 days pregnant when in fact conceived 25 weeks 2 days what date should be relied on?
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How early can a hysterosonogram show if you're pregnant?

You should not perform a hysterosonogram if you are pregnant. Perhaps a transvaginal ultrasound.


Had an ultrasound yesterday. LMP was Nov 2 so you should be 7 weeks The ultrasound only showed you being 5 weeks pregnant you are going back next week for another ultrasound Should you be worried?

You have two due dates...one accourding to your last period and one accourding to the size of the child on the ultrasound...i think the ultrasound one is more accurate


If you were 23 weeks pregnant on your ultrasound and went back 4 weeks later how many weeks should you be?

if you are 23 weeks pregnant , then go back 4 weeks later you should be 27 weeks pregnant. Almost 7 months.


If you took an ultrasound on the 11 April because you have irregular periods and it said that your due date is November 05 2008 When should you say you conceived?

Roughly Wednesday February 13th 2008


If you want your baby to be born in April when should you get pregnant?

Babies born in April are conceived between late July and mid August.


Your ultrasound showed that you are 6 weeks pregnant but you should be 9 could that mean you are having a miscarriage?

An ultrasound at 6 weeks should show a fetal heartbeat, if there was a fetal heartbeat you're not miscarrying.. It's probable you estimated your due date wrong.


Can you have a glass of wine the day before your abdominal ultrasound?

If you are going to take an ultrasound because you are pregnant, then the answer is no. It usually depends on what type of ultrasound. Some of them, you can't even drink. But preferably, no, don't drink alcohol before an ultrasound.


How big should you be at 5 weeks pregnant?

You shouldn't be big at all. At five weeks pregnant you have just developed an embryo. An ultrasound typically will not even be able to detect a heartbeat yet.


What happens if you've already conceived when you start taking birth control pills?

You should not be pregnant when you start taking the pills as you start taking them within a week of the start of your period and if you have a period you are 99.5% sure you are not pregnant. However if you are pregnant the pills will have no effect.


When given a dating ultrasound do you need to subtract two weeks for an actual date?

When you have a dating ultrasound you are given an EDD (estimated date of delivery) If you count back 40 weeks from this date it should be about when your last period was. If you do not have a regular cycle they may not correlate exactly. 38weeks back from your EDD is approximately when you conceived.


When does ultrasound happen?

Usually a doctor wants to see you for the first ultrasound when you're appr. 10-13 weeks pregnant.


Took birth control while pregnant for 2 months?

You should probably see a doctor and get an ultrasound since birth control can have harmful effects on the fetus.