7 weeks but sac measuring behind..

jυlιe 🙈 • I've got 3 👼❤ My rainbow baby boy was born 3-10-21 😍👩🏽‍🍼👶🏽🌈

So I'm about 7 weeks and baby is measuring 6 weeks 6 days. But the gestational sac is measuring a couple days behind, about 6 weeks 4 days.

The doctor didn't seem too concerned.. a week ago the baby measure 6 weeks on my dating scan, with a HB of 164.

We saw the HB today during the US. but I'm just concerned with the growth of the sac. maybe I'm just worrying myself sick. my anxiety is so bad, and I constantly think I'm going to miscarry after having miscarriage before at 6 weeks.

here's my ultrasounds

The one from today:

the one from last week at 6 weeks:

I know its early and I have 2 whole weeks until my next US. and I know I'm going to be so anxious for the next 2 weeks. 😭

any advise or has anyone been through this ? what were your outcomes?