Fetal Doppler

Zorayah • I'm a FTM engaged due Jan 8th,2016 with a little girl 💜❤️💗👶🏼
I'm a FTM me and my fiancé have been together for 2 years and I'm 17 he's 19 my mother in law just ordered a Doppler and I was wondering if it's safe I'm 14weeks and 5days I would love to sit at home and hear my baby just kinda worried hear mixed review so need help determining if it's safe or not