Can't find heatbeat anymore (home doppler)

Hey all, so I'm 9 weeks 2 days and have successfully been able to hear babes heartbeat from about 8 weeks with my home doppler. Last night I tried for a listen and couldn't find anything, I tried 2 times today and again, nothing. Has this happened to anyone else, being able to find it daily and then all of a sudden not? Is baby just hiding out further back in the uterus? Obviously I've got myself into one hell of a panic right now, I'm just so worried that I won't hear it again. Ever. My anxiety is over the top right right now. Should I worry, is this normal, help!