I also have womb music, I absolutely love it. exactly what she said though, use it with a grain of salt, you may not find the heartbeat each time or right away and the first 3 weeks I was so embarrassed and sad because I'd been finding my own whooshing pulse instead of babys and I didn't know! (there are veins low in your pelvis with your own pulse... babys will be much much much faster than your own). but I loved having it especially past 15 weeks when it was really clear and it gives peace of mind. don't stress yourself out with it though, if ever worried just go to the Dr it's what they're there for with the medical grade stuff. good luck@
Just FYI it's super hard to get the heartbeat at home with a fetal Doppler until 12 weeks or so. I thought I'd found it but it was definitely just my heartbeat lol. But get one!!! I have the wombmusic one