Fetal Doppler/Finding Baby’s Heartbeat

Hi there! I just got my fetal Doppler and couldn’t wait to use it. I’m 10 weeks 4 days. I tried a couple of times at different hours with no such luck😒😕

Any tips on how/where to try to find baby’s heartbeat? Or would it be difficult because of my size? I am plus size weighing 255 lbs. After 3 miscarriages, this is my way of giving myself peace of mind in between appointments 😔