Baby measuring 6 weeks ahead

[Aranah]

Hey there

I've recently had similar issues.

Your FH isn't the baby, it' your uterus size...so your uterus is measuring 6 weeks ahead of dates. And at your 21 week scan, there is often a 2 week either side difference.
Your LMP date probably put you ahead because you ovulated late and therefore conceived late. If it were me, I'd be going by the scan date (the 9w) over the LMP as if it's a month's difference, I would think a scan that early would be more accurate than LMP.

My FH has consistantly measured 6-7 weeks ahead of dates. This pregnancy was scan dated as I did not have regular periods and I used the early scan as dates. One OB I saw was concerned I was measuring so far ahead of dates that she ordered a GD test and a scan at 32 weeks. My scan came back saying my baby is large and I tested negative for GD. My baby is measuring two weeks ahead, but it all can depend on growth rates. For example, my baby might have had a growth spurt just before the scan, or my baby is just a big baby which is going to be the most likely scenario. Saying all this though, scans for size are not really considered accurate past 12 weeks. I have been told my the OB to expect a 9-10lb baby but I am not really taking too much notice of this. I know my baby probably will be larger than smaller, but I would be surprised if he is this big, just because in the past the scans I had for size were wrong with my other babies.

So what I'm trying to say is that by most indications FH is not an indicator of a large baby or that you are further along that you think you are, nor is sizing done by later scans. Because you had the 9w scan, that is the one you would be looking at for accuracy, not the later scan nor the FH...I hope I'm making sense.

But if you are worried I would definately talk to your OB about it, but most arent' concerned by a larger FH after they rule out GD and maybe fluid issues.

Welcome to BB by the way