Anyone else uses a home Doppler?

Hey guys! Does anyone else on here use a home Doppler? I just want to know if it's safe meaning radiation or something wise. I'm 14 weeks and yesterday I heard my baby's heartbeat perfectly. Ever since then she's just been hiding! I'm freaking out. I'm extra paranoid with my previous loss at 8 months:/ so of course I'm just super cautious and my every 2 weeks appointment wait is sooo long. 
Does anyone else use it? If so does your little baby run from it as well?? Thank you in advanced!