BFP was faint positive now 6 weeks low hcg

When I first got my bfp it was 4 days before my expected period. Went to two free pregnancy test place and both came back positive and they said they weren't faint. Now that I'm supposedly 6 weeks I went to the ER for slight orange discharge and got two ultrasounds and blood work done. They couldn't see the baby but I saw the sac. They also said my hcg levels were at 291. I have to go back in two days. The transvaginal ultrasound gave me slight spotting today and I've never had spotting since I got pregnant. I have cramping but I've always had cramping. Whether its pms and i feel when I'm ovulating and where the egg drops. Periods/spotting while pregnant runs in my family as well and I was consider a miracle child due to the fact that my mom had tumors on her uterus and her Fallopian tubes were beside her back and I wasn't suppose to be able to find it or survive. Neither of us were. So I'm not sure if the cramping is a sign of a mc for me. I'm not sure exactly when I conceived but I used OPKs to tell me when I ovulated and I got implantation cramps at 10dpo. I know my levels are low but is it possible that the baby will pull through? I'm sorry if it's a lot I've just been stressing about it immensely. The doctors were in and out so quick and never brought up the possibility of a miscarriage and when I went in they brought up ectopic and after the ultrasound they didn't speak on it anymore.