My baby's beat App

Hi ladies! I broke down and bought the app today but I'm having a hard time hearing anything. My heartbeat is pretty clear but when I put it to my belly there is a lot of background noise. I can sometimes hear something rhythmic in the background but there is a lot of other noise. Is that the baby moving around? My other bodily noises? How can I get this to work better and make me relax that this baby is doing just fine?! I did take my case off BTW.