Could find heartbeat but now can’t at home?

**Yes. I know this is why people don’t recommend at home dopplers. I’m not panicking just looking for others stories so please try to only comment if you Can contribute :) ***

Has anyone been able to find baby heartbeat at home and then not again for awhile? I found the heartbeat for 4 days straight starting at 8w5d. I got so lucky! But now at 10 weeks I haven’t been able to find it since LOL. Has anyone else experienced this? I finally have my appointment tomorrow, so I know I’ll figure out if something went wrong or not obviously. Just looking for others stories. Thank you in advance!