First prenatal appointment tomorrow. So nervous!!!

I got pregnant march last year and never even though anything would go wrong, but then I miscarried at 13 weeks because the baby had a genetic disorder. I got pregnant again 2 months ago, in March again! But I'm so scared. I'm scared to miscarry again and scared that when I have my ultrasound tomorrow, they won't be able to find a heartbeat or that something else will be wrong. I know there's nothing that I can do but I can't shake the nerves.