Couldn't find the heartbeat on home doppler

Anne
So I don't know why I'm so disappointed, 11 weeks tomorrow and I can't find the heartbeat on my home fetal doppler. Just spend around 15 minutes searching and only managed to hear my heartbeat in about 10 different places. Frustrating because I got it so my mind could calm down because after 3 previous losses I'm so scared somethings not right with this one..any tips?