Baby’s heart beat from app?

Question

Has anyone used an app to find baby’s heart beat? I know they’re usually unreliable! 
I’ve downloaded an app called shell by Bella beat (I think) and you use your phones microphone to record the heart beat... 
It records it and then you can share it in a link... 
this is the recording I got tonight and I swear it is baby’s heart beat! I found mine as well and it’s slower... 
just wanting to know if anyone has been able to do this? I first found one at 14 weeks and I’m now 17 weeks :) 
https://shell.bellabeat.com/share.html?id=sldab142fbe8baf6492480341b4c578fdd49

Answer

I'd say its probably not baby... Your phones microphone would never be strong enough to penetrate the layers of skin, muscle, fat, and uterus etc, to be able to pick up baby's heart beat, or yours for that matter.