Frustrated

I don't understand why after a miscarriage I have to wait til 12 weeks to get an ultrasound. I will get to hear for a heartbeat at 9 weeks on august third. But this is driving me insane I just wanna know if it's ok why won't they let me see it before 12 weeks 😞😓 even if I'm willing to pay out of pocket for it why can't I request one. I'm having severe anxiety attacks over this and it's making me insane I just want to know if it's ok.