At home fetal doppler..should I?

A
Alright guys, I need some serious input. I really want to buy the Sonoline B Pocket Fetal. From the research I've done it is FDA approved and considered safe. I had a miscarriage in November and I feel like it would give me some serious peace of mind in between doctors visits. However I've heard sometimes you just can't pick up a heartbeat. Whether it be the baby moving around or them being in a difficult position, ect. I'm curious of your opinions of the peace of mind vs not being able to find the heartbeat. Thank you!