Do a search of the BellyBelly site and you'll find lots of threads about the potential effects of dopplers on babies.

I bought a first beats one (rented it until the purchase price was paid off) during my PG with Kynan and found his HB around 11-12w. I approached it with the expectation that it would be difficult to locate a HB until well into the 2nd tri so that I wouldn't be too worried or disappointed if I couldn't find it. I have used it for this PG too. I try not to use it unless I am starting to really get stressed, so maybe once every 5-7 days and that naturally stretches out a bit the further into the PG I get and the more movement I feel.

Personally I have found it to be invaluable, especially after having 2 m/c (including a late missed m/c). I also have a medical condition which contributed to my losses and which stress can cause to flare up so having major stress outs doesn't help anything LOL.

All midwives would have a doppler I'd think. My GP has one as well but it can take a couple of weeks sometimes to get an appt to see him.

HTH.