First ultrasound this pregnancy and kinda worried

Rachael • 30 y/o mama to Ryker and Zayden.

Based off of early miscarriage dating (never had a period in between) baby was thought to be 9w2d but measured 7w5d with heart beat and we even saw some movement and a leg or arm.

They are sending me for another dating scan with a better ultrasound machine in a few weeks but she said she would move my littles gestational age to 7w5d. She said I probably ovulated later than I thought. This can’t really be possible considering I got a positive pregnancy test pretty early after the last time we had sex? I’m worried something is going wrong and baby is too small…

Here’s the dates of things for the low down

Miscarriage June 26th

Sex: July 7th

Positive pregnancy test: July 18th. (I was previously testing negative after my miscarriage so wouldn’t be related to that pregnancy)