Measuring behind but heartbeat stronger?

Alex • 6/30/20 💙

This ultrasound was done transvaginal last Wednesday, I measured 6 weeks 5 days with 130 HB.

This one was done today abdominally exactly 1 week later, but only measured 7 weeks 2 days. HB was 157 though and we could hear it. Just concerned that I only measure 4 days more than the scan from last week. :/