Fetal doppler-hearbeat. 10 weeks

Christy 🥀

anyone use a fetal Doppler? I used it at 9 weeks and found the heartbeat the first time. now I have tried 3 other times with no luck. I know not to be worried, but I just can't figure out what I'm doing differently...other than concentrating on the spot that I found it before...which I really tried the last time to not do.