Ultrasound measuring behind

Hi there - TW previous losses.

I had 2 recent losses one back in July and again in November. I’ve had 2 ultrasounds so far for this pregnancy. My first ultrasound, I went in 7w3d and was measuring 7 weeks. Went back in today 9w5d and was measuring 9w1d. I know this is in normal range but I’d never measured behind with my two boys so I’m *slightly* freaking out. HR was 120 at 7 weeks and 175 today. Think I’m just stressed about another potential loss. Anyone have similar experiences that turned out positive? Would love any advice or support.