Downloaded BabyScope App

So in my excessive worrying in the middle of the night I desperately spent $5.99 and downloaded the Baby Scope App.  I was weary because I am only 16 weeks but after a good effort I got a nice recording of our baby boys heartbeat :) Anyone else have any experience  or advice getting better readings using this app? It does say for 3 trimester so not worried I can't find his ❤️beat everytime.