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@birdofafeather: Congrats!! If you're sure you O'd later and are only at 4 weeks, I would call and reschedule your appt. Unless you don't mind going in..
I had the same sitch this time around and had my OB schedule me 2 weeks later because I knew they were going to do an ultrasound on me. I wanted to be able to see my LO and the heartbeat at my first appt.

I agree I would call them back. Just tell them what you have told us and let them decide if they think you should reschedule.

My midwives went by my charting date to start, and checked it against my first ultrasound at 13 weeks. It was exactly right.

I'm 33 weeks and have been measuring consistently with my O date from the start however my Dr refuses to change my due date and will only go by the EDD based on my LMP. It's only a week difference (I've always O'd early which was confirmed with charting) but still kinda bugs me.

1. Congrats.
2. Yes, They wouldn't listen to me, and brought me in, and then they freaked because on the ultrasound he was measuring 7+w not almost 10 weeks. Their EDD based on ultrasound was one day after my EDD based on charting.
They still freaked that he was growing too slowly, even when I SHOWED them my chart. Yeah... trust your chart, but go to your doc when they want you to.

From the beginning, I fudged my LMP based on the due date I got from Fertility Friend. It's really much easier than trying to prove something, but it may be too late for you!

Congrats!!

Congratulations!!

My first appt was at 5 wks with the Nurse Pract and when she tried to calculate my EDD based on LMP, I told her that I had longer than average cycles and gave her my O day. She wrote it down and at my next appt with the Dr, they did a transvag u/s and verified that my calculations of O day were correct.

@birdofafeather: nope, didn't even meet dr, just gathered info, took blood for tests, went through health history. at our second appt - we met the obgyn and got the tranvag u/s (6 weeks).

@birdofafeather: They didn't even LOOK at my chart. They just said, based on LMP we "need" you in at this date.
And then they got all scared when he was measuring "small" (like a couple weeks small!).
So they did another u/s at my "real" 10 w appt (11w actually) and he was growing right on track with what I charted. They still don't care about my chart, and just say my EDD is based on u/s. Doesn't really matter.

I told my doctor that I'd been charting and didn't O until CD28 and that I was 100% positive about it but he still made my due date based off of my LMP. Each of the U/S followed along with my dates though so he eventually changed it to reflect what the ultrasounds were saying

I told him when I thought I conceived based on my charting. He asked when was my LMP and also what my cycle length was. He was comfortable with not setting a specific due date until the ultrasound for dating. He'd refer to the gestation age as a range....like he'd say, "So you're 13-14 weeks along".

The ultrasound dated me 10 days earlier than my charting.

And then baby was born 14 days before that!!!! So in the end, he was born way closer to the EDD based on LMP rather than my charting. I still don't understand how this happened: I thought I was SUCH a good charter. Plus, I took a pregnancy test a week before, negative. I even took a pregnancy test at what I thought was 14 days past O, negative, and it was positive 2 days later.

Whatev.

I say go with the ultrasound's dating.