Sooo I am chunkier (200lbs) and 12 weeks pregnant today. I was using my app on the phone to find baby’s heartbeat because he was so low but today it was very hard to find and I think I only found it briefly but it has me nervous... is it normal to be difficult to find the heart beat at 12 weeks?

UPDATE I went to my OB today 2/5/2020 and my little man is just fine 🤰🏻😍 he was moving all over and had 137 bpm which I was told was normal and he was so active they said he appears very healthy. Ty for all of your responses and easing my worry.