At home Doppler giving me anxiety

I purchased an at home Doppler in hopes to ease my mind. It worked at first. I was able to find the babys heartbeat at 10 weeks and 11 weeks. Both times very quickly! Last night, at 11W 5D, me and my husband tried it just for fun. We weren’t able to hear anything after 20 minutes of trying. I tried my best not to panic and went to bed. I woke up this morning and tried again, still nothing after 20 minutes. Idk what to do. I want to be checked out for my sanity but I don’t want to sound crazy.