Have any of you ladies ever used My Baby's Beat on your iPhone? https://www.mybabysbeat.com/ It says you can't hear anything till weeks 30+ (probably to cover their backs) but I tried it out today (11 weeks!) and I swear it worked!! I found my heartbeat no problem. Nice and slow. Then out of nowhere I heard what I hope was babies!! A lot faster than mine was, clear as day! Is this even possible??? Can it really work??