So here's the deal. According to both my homebirth midwife and the OB practice I saw for a while as a backup, my due date was August 31. This was based on the LMP calculation method. It should be noted that I am still breastfeeding DS and had had no periods until the one before conceiving, so there is no guarantee that it was regular. But my LMP was November 24, 2010.
I also know the exact date on which we did the deed resulting in pregnancy -- we only did it once that month, late at night on December 8, which was Day 14 of my cycle. (Sorry if TMI.)
Now, according to the LMP date method, and assuming that I ovulated on the 8th or the 14th day of my cycle (which of course the LMP dating method does), that would be the exact date I conceived. Which, of course, makes no sense because I could not have conceived before having intercourse late that night on that day. In addition, I have always had 30 or 31-day cycles and ovulated relatively late.
Add to this the fact that at my 8-week dating ultrasound, and written on the printout, my baby's gestational age was estimated at 8 weeks exactly. That was on January 24, which would mean that my LMP would in fact have had to be on November 29 for that estimate to be correct. But it was on the 24th. Following me? Good, because I'm not...
In short, the estimate from my early dating ultrasound puts me at 5 days behind my "official" due date of Aug. 31, which is based on the LMP/Wheel of Doom method. My alternative due date would then be September 5. But everyone seems to want to go by the earlier one, because, as the OB said, "Well, there's not a big difference in dates there."
Yes, there is! That's five more days to not have to be induced or have transfer of care to the hospital (unless a problem arises)!!!
My midwife (whom I love!) has always gone by the LMP method, even though I've brought up my concern that the Aug. 31 due date I have is too early. I'm not sure how seriously she'll take the dating ultrasound info, because it's not particularly clearly charted in my OB's files. The only hard evidence I have is the little photo printout with the gestational age and the date of the ultrasound printed on it.
So my question to you wise women is this -- which date should I take more seriously? The early ultrasound date or the LMP date?
Argh. I am a crazy person. I just hate this pressure to pop the kid already...