Sunday, January 10, 2010

When is this baby coming, anyway?

Now that we know that I'm pregnant, I've been trying to figure out exactly how far along we are. It's confusing!

According to FF, my due date is September 14th, 2010. (This is based on my ovulation date.) Several pregnancy tickers have said that this means I am 4 weeks and 5 days today. Sounds about right.

Then, I checked out What to Expect When You're Expecting. By the same due date, they calculate this as 5 weeks and 3 days.

To make matters even more confusing, if I use the first day of my last period (as many ob/gyns do), it says that I'm 6 weeks along, which for some reason, What to Expect actually counts this as 7 weeks!! I'm definitely NOT that far along yet. I do understand that the first two weeks of pregnancy you're not actually pregnant, but my cycles are long and I ovulate late so figuring out how far along we are based on LMP wouldn't be quite accurate.

I'm hoping that the RE can shed some light on this tomorrow when I go in for blood work, but I may just have to wait a few weeks to have our first ultrasound done.

Anyone have any ideas?


  1. I was never given an "official" due date by my doctor during my pregnancy for those very reasons--the delayed ovulation caused a discrepancy between the size of the embryo and the LMP-method of dating. Maybe I would have been given one around my 6/7/8 week ultrasounds if the baby had been progressing normally.

    Are you having an ultrasound during your visit tomorrow? If so, be prepared to see essentially nothing at this point. We saw a teeny tiny smudge during the u/s in our 4th week (at which time the m&m nickname was born).

  2. I wouldn't think they'll do an ultrasound tomorrow-- If I go with the most conserative estimate I'd only be 5 weeks on Tuesday, so I'm guessing they may wait until the following week to look for a heartbeat? Is that when you had yours done? Between 6-7 weeks?

  3. I actually had at least one every single week of my pregnancy once I got the BFP-- 4/5/6/7/and 8. Because of the spotting/heartbeat issues and also because my doctor is kind of wand happy (she would give me ultrasounds at regular checkups when I wasn't even TTC).

    But they were planning to do the heartbeat check during week 7 and I suspect that's when she would have dated it and sent me on to an OB.

  4. However far along you are, I wish you a healthy, happy pregnancy. Yip yip yip!

  5. You're right Stef, a long cycle and late ovulation would mean that an EDD based on LMP would over-estimate how far along you are. But I can't figure out why "What to Expect" would have such a different EDD - they must use a different system but I can't understand why. Strange!

  6. Yeah, I had one done every week too but that is eventually what they will base the due date on anyways (the US). Of course with my history that may be why they did one so often however I'm pretty sure they waited until 6 weeks or so to do one so that i wouldn't stress about the heartbeat. I am so excited for you guys!! I will update you tomorrow on how everything goes for me...went to the hospital today for blood work and the babies were so little!! I was like there is no way he will be that little, right?? agh!

  7. I'd go with your O date until your OB says otherwise. That's so confusing, I hope you get an answer soon!

  8. Ohmigosh ohmigosh ohmigosh!!! YOU DID IT!!! Wow. I am so happy for you. Exclamation points don't even being to tell the story :)

    My doc dated me from my O date (since I knew that practically down to the minute), but then they'll probably wait to give you the "official" date until they can measure the little babe in a few weeks.

    I had my first RE ultrasound at 6.5 weeks, just barely big enough to see the heartbeat. Then I had another one at my "regular" OB at 10 weeks to date it and measure it.