Dating pregnancy irregular periods
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The age at the ultrasound includes the two weeks so whatever date they get from the ultrasound is what they will go off. But what if a woman hasn't had a period for two months before discovering she was pregnant?
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My last period was 20th March but I'm only 12 6.
There are two common ways to date a fetus- one is going off your last period, the other is going off the conception date.
For some context on reliability of pregnancy dating methods, with my first I was having regular periods but not charting ovulation & I didn't have a dating US..was born 6 days before her due date.
And really, it doesn't matter I understand what you are asking but have the same answer.
Our first scan measured the baby's size and confirmed that my due date estimation was only 1 day off, meaning the baby was he size of an 8 wk fetus.