6 weeks 1 day and baby 64 bpm


Hi everyone, had my first Transvaginal ultrasound expected to be exactly 8 weeks and measured 6 weeks 1day. Have another US scheduled in 2 weeks. Doc saw the heartbeat flutter but from everything I read, even at that time the heartbeat is usually stronger and have seen lots of post around the same timeframe having much stronger heartbeats. She said that it was just the start of a baby’s heartbeat showing but I am still nervous. Anyone else have experience? I am hoping in 2 weeks with the followup that the heartbeat will be stronger but just nervous.