Pocket Fetal Doppler Question

So I have a pocket fetal doppler from my first pregnancy in 2016 and I think it was right around 8 weeks right after my first OB appointment that I was able to find my daughters heart beat at home. Now with my third pregnancy, I am currently 10 weeks as of today, and I have been trying to find the heart beat since around 8 weeks and haven't had any luck.. We did see a strong heart beat of 146 at my 8 week OB appointment, but due to having a missed miscarriage with my second pregnancy this past October, I am worried that I haven't been able to hear it yet at this point. Has anyone had similar experiences of not hearing the heart beat on their home doppler around 8-10 weeks, and everything turned out just fine with the baby? I know I am probably overthinking and that everything is probably just fine, but it's hard not to worry after miscarrying. Just looking for some reassurance.