Tiny beats app

Has anyone else used this app? I am 9+3 (so I know it's extremely early for the app) and picked up 48bpm a 96bpm and then for about 10 seconds earlier today I got 148bpm!!! What do you think of the app if you've used it? I previously had a MMC so it made me a little more confident when I saw the higher bpm until my partner came home and tried it on his belly and got 98bpm straight away haha and there's definately no baby in there!