missed abortion 😓

I'm so nervous. My baby stopped growing at 8 weeks and my OBGYN keeps scheduling me for appointments every two weeks, now I'm 13 weeks and the baby is still inside me. It's torture. I don't feel any signs of miscarriage, and it sucks that every morning I wake up feeling nauseous and it's just a reminder that my baby died. What should I do? Should I wait for my next appointment or go to the ER? I'm really lost, depressed, and overwhelmed.