9 weeks 2 days....😕

I’ve been using this pocket heart doppler, it was very cheap like $20 I had bought it from this girl who said it worked for her. I know I’m early but I’ve tried everything EVERYTHING to hear this heartbeat and nothing... I saw it flicker on the ultrasound at 7 weeks but wouldn’t I be able to hear it now 😩😩 it worries me. I just want to be reassured. Have been through this a lot and just need something to cope with.... being honest here I find myself just wanting to go to the er just so I can see if everything’s okay. My anxiety is through the roof right now.