Little bean measured 5 days younger than LMP date...should I worry?

tiffanymyers · February 2014

I had a wonderful ultrasound yesterday and a heartbeat was found...woohoo! Our little bean measured 5 days younger than the date of my LMP though. My OB didn't seem worried by that but she was in a rush to catch a flight to go to Colorado, so she seemed more rushed than she normally is. Should I be concerned about the mismatch in dates? My next ultrasound is 9 days from now at my request.

HorseLover11 · February 2014

The u/s can be up to 5 days off in general but are you positve when you ovulated?

ksulli · February 2014

At my 8w u/s she took 3 measurements and got a span of 3 days, so that's my proof that there's a margin of error. Also, like @HorseLover11 said, if you weren't charting, you could have O'd a few days later than CD14, which is what LMP assumes.

tiffanymyers · February 2014

I am not certain when I ovulated, but I am glad to hear u/s can be off up to 5 days.

kimmyberly26 · February 2014

I agree with the other ladies, unless you know when you ovulated than the baby could be measuring right where it should be. For instance, I ovulate on day 16-17 and not the typical 14.

tiffanymyers · February 2014

Thank you so much for your supportive words! This was also my first normal period after losing our last pregnancy, so there are probably a few variables I can't pin down. I really hope this little baby is our rainbow babe!

CaitNMatt · February 2014

At my first u/s baby was measuring an entire week behind and my dr never said a word. I knew I had ovulated about 4 days later than normal though too. I'm 19 weeks and everything is going great! Dates and u/s machines can be off so I wouldn't worry!!

cawettig · February 2014

Lo measured a week behind until our a/s.

stefuge · February 2014

::lurking:: I just wanted to share our experience - DS1 was measuring small by a few days at our first u/s, no big concern. But as my pregnancy progressed, he was measuring smaller and smaller at each u/s we did, at which point my doctor was concerned and we did more u/s and NSTs to keep a closer eye in him. He was little when he was born, but was completely healthy and we made it to full term. At this point, I wouldn't worry yourself about it, but just keep an eye on it, and know that your doctors will be as well.

chknma · February 2014

I was measuring behind at first u/s (around 9 weeks) based on ovulation that i charted. LO now consistently measures 10-14 days ahead and im into third trimester. Congrats on your good u/s!