I had such an anxious day today and after resisting to try my home Doppler I gave in and got it out. I thought I heard a heartbeat but lost it so then spent ages trying to find it. I then thought gosh I've been at this ages and then panicked and googled how long is it safe to use a Doppler for and read horror stuff. Rang the midwife and they said it would be fine but I'm still worried it may have been as long as half an hour I was trying to listen but I really have no idea! I don't know how to stop worrying?