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That means it is the date conceived (or within 48 hours of). It is never right on, but within a week of. Go by what the ultrasound says. No, if your ultrasound says 17 weeks and 2 days that would be that date plus 2 extra weeks, that is around the time of your last period, unless you have irregular periods or conceived straight after a miscarriage or something. The length of pregnancy is always measured from your last period even by ultrasound.

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19y ago

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When you go for a ultrasound and the doctor tells you that you are twenty weeks does that mean you conceived twenty weeks ago?

No. Your due date is calculated from two weeks before actual conception. You are actually pregnant for 38 weeks. You conceived 18 weeks ago.


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It means it is approximately four weeks since you conceived, but six weeks since the start of your last period. Pregnancies are dated from the latter date, so you wouldn't say you were four weeks pregnant.


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Around 2.5 weeks ago.


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Subtract fourteen weeks (7 days x 14) from the date of the ultrasound.


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