Twins heartbeats

Megan • Twin baby girls 12/2021. 💕 Baby #3 due May 2024 🤍

Hello! At 7 weeks I had an ultrasound and saw both of my twins heartbeats. At my 8 week ultrasound we could hear and see baby A’s heartbeat but could only see baby B’s. Has this happened to anyone before? My doctor wasn’t concerned at all and you can definitely see the little flicker of a heart. I live in South Korea where the ultrasound technology isn’t the best and the language barrier can be even worse. I appreciate any input!