Got my Fetal Doppler today!

I got my fetal Doppler today early! Was suppose to come Saturday. I'm 9weeks 3days! I hope it works! I need the peace of mind! I miscarried with my first pregnancy. My 2nd pregnancy my son was 6 weeks early. I want a healthy pregnancy and child more than anything! I'm probably going to be a single mom because the father still isn't onboard so this is a heartbeat to keep fighting for! I've only heard the heartbeat once so far at exactly 7 weeks when it was confirmed. So excited!!!