It can be difficult to get an accurate reading when the baby is so little. It moves and they have to start all over. I went for a 7week scan and my baby had a faint heartbeat, I'm now 31+5 and she has a completely normal heartbeat and is healthy. I wouldn't stress over it if I were you.
Thank you all so much your comments are so reassuring!!!!!!!
I had my first ultrasound at 6 weeks and 2 days. The heartbeat was actually quite present. But keep in mind the baby's heart doesn't form all 4 chambers of the heart until around the 9th week and that has a lot to do with the strength of the heartbeat. That means more blood to pump and being able to have a ventricular and articular normal counterbalance than before. The baby will be fine just focus on your diet and fluids.
I had a bad experience with this but stay positive. No need to worry your babys heart just started beating and is still getting use to it.
6 weeks is still early some don't see a heart beat at all until 7 weeks.
Same thing happened to me, they said the heartbeat was too slow and that a miscarriage was likely. They did another ultrasound about 2 weeks later and it was just fine. I'm almost 37 weeks now and he's doing great so just hang tight!
But my friend have a scan yesterday and found out she was 7 weeks and there was only a small heartbeat there so dont stress its only a small jelly bean :)
Goodluck