Slightly nervous because of slow growth

[JustLooking_30]

I've had 2 ultrasounds so far; first at 6w5d and the second at 7w4d.

The first, the crown rump length was 2 days off, and in the second, it was 4
days too slow. Otherwise things look great- the heartbeat seems to have gotten faster (the nurse eyeballed it to be about 140 bpm -very scientific, I know), the baby looks well defined, and there has been quite a bit of growth.

But still, the embryo is supposed to grow at 1 mm per day- mine is growing at about 0.74 mm per day. Are such variations from average often seen in normal pregnancies?

Smaller CRLs are associated with aneuploidies and M/Cs, so am understandably
nervous.

[porcelina]

The first ultrasound being off is not a concern because you can't expect it to match perfectly with your LMP dates. The second scan was only 2 days off, if you measure from the first to the second. If they saw the HB, and it got faster, that is an excellent sign. I was very worried because I had one around 6w5d and they could not find the HB, plus it was measuring 6 days instead of 8 since the last scan (I had an early one to rule out ectopic). Everything turned out to be totally fine, they saw the HB the next week, and it was no big deal. While they say there is not much variation at this early stage in terms of growth, I still think there is some. You should be fine! Again, the strong HB is a huge sign! Reduces chance of miscarriage to only 5-7 percent.

[MaerynPearl]

first trimester ultrasounds are frequently off by a few days... and it can vary one way to the other. Weeks would be odd, but days is quite okay!

[ma_Donna]

That seems like a pretty short span of time very early on to be very accurate. A milimeter is very small and if the baby is at a slightly different angle, the curser was clicked just as the baby was moving, etc. that could easily result in the measurements being a bit off.

Take care

[birthangeldoula]

Early ultrasounds can be off a few days going in either direction. The fact that the baby grew and that the heartbeat has gotten faster is an excellent sign.