Which date would you use

cammlyn · March 2016

hey guys. So as you guys know this will be my first pregnancy to go to term and at 10w1d (based on LMP) I have never been this far along before.

We we have a wonderful 2week check up again today but the tech told us our baby is measuring more like 10w5d. The doctor didn't seem to think I need to move my due date and as I said I am new to this. Should I go by what I am based on my LMP or how big the baby is?

Has anyone else had this happen and the size was more right then LMP?

i hope you all had good weeks

thanks again for any answers

RiverSong15 · March 2016

Growth can speed up or slow down a bit, and usually doctors won't change a due date unless you're really far off (by a week or more). They will probably stick to your LMP due date. But congrats on your pregnancy and making it this far!

linzandjer11 · March 2016

Exciting! Due dates are silly anyway. Most women don't give birth on their due date.

Same thing happened to me, but baby was a little smaller than LMP. My midwife said took with the ultrasound.

I'd go with which ever is farther away. So you have a larger window to not get anxious if you go past your due date.

cammlyn · March 2016

Thanks guys

my doctor just brushed it off when I asked so I really didn't know if it was a common thing ot not

carrieandr · March 2016

The lmp date is a guess. Not everyone ovulated on day 14 of their cycle. My baby has consistently measured ahead since the beginning (I had u/s's around 5, 6, 8, 10 and 12 weeks) and I was temping, so we knew it matched when I said I ovulated. The dr changed the date on mine, but didn't change it again when I measured another day ahead around 12w. He said the earlier measurements are the most reliable.

cammlyn · March 2016

This baby has too. 6,8, and 10 weeks. And each time it has been 4 days ahead. I just thought it made sense to move the date

jgbennick · March 2016

LMP is used because time of conception and implantation are too difficult pinpoint. Because of that, due dates are really an estimate. But like RiverSong said above, unless the measurement is a week off most doctors will not change your due date. IMHO you don't want to change the due date. Mine was changed with my son and I ended up having to have a c-section because I was only 2cm dilated a week after the due date. If it hadn't been changed I could have gone another week. I'll never know if he would've come on his own or not.

rkrichey · March 2016

I would wait until your anatomy scan to change any dates based on ultrasound. But yay for another great appointment!!!

carrieandr · March 2016

@jgbennick made a good point that I never thought of. But you can follow a different date than the dr. That way you can look at the weekly baby updates and know what's happening in there.

UponAStar16 · March 2016

I'm confused about this too, for a couple reasons. Any EDD calculators are one day off from the EDD my doctor gave based on the calculate they used, and even at that they said I was 8w1d at my u/s and baby measured right on time at 8w1d, but I would have been 8w4d (my calculation) or 8w3d. I'm confused if this changes when I can count being onto the next week, and how they got those different calculations since it didn't match up at all (like saying it's 10am in NY but 6:30 in CA). Not sure if this made sense...

edit: Also, since I wouldn't go past 39 weeks anyway I'm not sure if that changes the EDD too

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