need advice!!!!!

Hi! I’m curious to see if I’m freaking out for no reason?? I had my last appointment at 9 weeks. I am 11 weeks 2 days now. My doctor was able to hear the baby’s heart rate on her fetal Doppler at 9 weeks. It was (160). However I have an at home Doppler that I can’t seem to find the heart rate on… I’m freaking out…. THANKS!!!