Worried.. can’t hear heartbeat on Doppler at 10 weeks

I’m 10 weeks, 4 days and everyday I have SEARCHED for my baby’s heartbeat and I can’t find it 😭 I’ve watched COUNTLESS videos, and I used to always use the Doppler for my first daughter and could always find it! I have an ultrasound on Wednesday and I’m BEYOND worried that my baby doesn’t have a heartbeat because I can’t find one!! 😭😭😭 does anyone have any stories that relate?