I found out on 12/31, that I was expecting again. I went in yesterday for my HCG beta and the first…

I found out on 12/31, that I was expecting again. I went in yesterday for my HCG beta and the first draw was 28.6, and 2 hours later it was 36.1. I go tomorrow for the next beta. I’m scared because I’m cramping, have pelvic pain and back pain. The nurse who gave me my discharge papers yesterday said I am having a miscarriage because my levels are too low. I’m trying to hold onto hope that they will double tomorrow.