10 weeks measuring 9...normal?

D • Wife. Mama. Full-time career. 1 sweet boy and boy/girl twins

Hi everyone! Just looking for a little insight.

I'm currently 10 weeks pregnant with twins. We had out first appt at 8 weeks exactly and the babies were measuring 7w5d and 7w6d. Perfect.

Yesterday at 10 weeks, one was measuring 9w5d and the other 9w0d. This made me worry a little. They both had strong heartbeats and my Dr didn't seem concerned. He said it's very hard to get accurate measurements since its hard to tell exaclty were the bum is on the picture.

I was just concerned because at 8 weeks they were measuring right on track and now they are a little behind.

Anyone have anything similar or any insight? Thank you ❤