Totally normal! I could hear my son's heart beat threw the Doppler until about 12wks.
They struggled to find a heart beat with mine and I was 16 weeks. Sometimes just the way they lie with the placenta nothing to be worried about! X
Yeah that is perfectly normal sometimes heartbeat doesn't get picked up through a doppler till later on (12 ish weeks)
But I did see her at 10 weeks so little thru vaginal ultrasound doctor showed me heart beat.
I didn't hear my baby heartbeat till around 12 weeks and it was very hard to find because they are very little at that time