so at my 12 week ultrasound scan, the baby's heartbeat was 162.. the one I had before that at 9 weeks, it was at 163.. but when I went for my gender scan at 15 weeks 5 days, it was at 147.. she wasn't moving around as much at that one. I think she was sleeping.. could that be the reason why her heart rate was at 147? I know baby's heartbeat goes down as they get bigger, but I'm just curious... she was also measuring 16 weeks 3 days.. what was or is your babys heartbeat at 15-16 weeks ?