Something I've been thinking about in regards to dating this (might be) pregnancy is what to tell a care provider. Here's what I mean: my LMP is March 1st, but I know that if I got pregnant, it was between April 1-3. Here are the "due dates" for each:
LMP March 1st: EDD December 8, 2011 (with a cycle length of approx 30 days) Probable conception date April 2: EDD December 24, 2011
So you see my situation? I don't think I could possibly convince a care provider to put down the December 24 EDD when my LMP was March 1st. It would be bad enough by itself, but add that to the fact that providers want VBAC mothers to give birth on or before their due dates, and also my history of giving birth 1-2 weeks after my EDD, and there's a big problem.
Say, for example, my baby would have come 1 week after the EDD of December 24. That would be December 31st. The care provider wants me to have my baby by the December 8 EDD, so if I consented (no!) to a RCS (no induction for VBAC moms), that would make my baby 3 weeks, 2 days early. Not good. And I don't suppose any care provider would be comfortable with me going (in their eyes) 3 weeks, 2 days past my "due date" either, would they?
So should I make up an LMP that fits better with when I know baby was conceived? I don't want an early vaginal ultrasound just for dating purposes. I know the small window in which baby was conceived, and I know that December 8th would be nowhere near when to expect him.