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Doctors count from the first day of your last period, LMC, as the first day of your pregnancy. In reality you typically will ovulate and become pregnant about 10-16 days after that. They also take into matter the length of your cycle, how long between periods. That's why 2 weeks early or 2 weeks late is considered normal for the prenatal period. As every woman ovulates on a different day of her cycle. A 12 week ultrasound will likely pinpoint how far along you are as most babies grow at the same rate for the first 3 months.

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16y ago

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How many weeks are in a pregnancy?

Forty weeks.36 weeks is standard but not everyone carries until full term and some go past the 36 week mark.Most doctors count 40 weeks from the first day of your last period.


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There should be at least be 40 weeks in pregnancy.


How weeks is complete pregnancy?

a full term pregnancy lasts 40 weeks


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Can you count back the weeks of your pregnancy from a dating scan to see when you may have conceived if your LMP is unknown?

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Does normal pregnancy last about 23 to 32 weeks?

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How do you count the weeks of pregnacny?

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40 weeks.


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Does a pregnancy not be 40 weeks?

It can from 37 - 42 weeks


How long does the pregnancy last?

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