confusion over pregnancy dates - messed up the first two posts

• Messages sorted by: [ date ][ thread ][ subject ][ author ]
• Next message: B: "Pregnancy Tests..."
• Previous message: Marti: "progesterone and pregnancy"

I used the following site for the calculations: http://www.allaboutmoms.com/pregnancytimeline.htm

I hope this isn't too confusing to follow. My cousin has two children. The LMP of her first pregnancy was on 10/19/99. On an ultrasound picture she has from 4/17/00 for that pregnancy, it says 21W1D+-10. We know that ultrasound goes by gestational age and not by the LMP, but even so, there seems to be a discrepancy of 2 weeks & 5 days for her first pregnancy and a discrepancy of 2 weeks & 4 days for her second pregnancy (having subtracted the two weeks after the first day of her LMP).

The LMP of her second pregnancy was 5/06/01. The ultrasound picture from that pregnancy (taken on 10/10/01) states that the age is either 17W6D+-6 or 18W6D+-6 (it lists both on the same picture). Again, there seems to be a discrepancy of about 3 weeks with that pregnancy as well.

What could be the cause of these discrepancies? She is certain of her LMPs. How would she go about calculating the dating of a possible pregnancy with such a discrepancy? She feels she may be pregnant again, but the last few tests have been negative. She has had many symptoms and they persist even after the negative tests.

Could you please shed some light on this? Thank you. Your expertise is greatly appreciated.

• Next message: B: "Pregnancy Tests..."
• Previous message: Marti: "progesterone and pregnancy"