Help! Slow growth?

Mama 🐻 of 2

So last week was 6 wks 2 days and baby measured 5 weeks 6 days with a heart rate of 96. Now almost 8 days later baby measured 6 wks 5 days and heart rate of 127.... I'm just so nervous after 2 miscarriages and we lost our sweet son at 28 weeks last May... I'm really hoping this little one is ok ♥️🙏♥️🙏♥️ I do know that I ovulated on CD 15 or 16 so makes sense to me measuring a bit small but I'm just nervous baby is slow growing... Here's today's ultrasound - thanks for any help!!!