Bleeding and miscarriage.

Has anyone ever had period like bleeding during the first trimester and still go on to have a healthy pregnancy? I'm 5 weeks pregnant and spotting bad enough that I'm using a pad. I haven't soaked through one, but I've been bleeding since last night and it's not slowing down. I feel like I'm on my period. I've got the same cramps as if I'm on my period. I went to the er last night and everything came back normal, no infections, my hcg was in the 1500s but they didn't have anything to compare it to since I haven't had any blood work done before that. I'm too early so the ultrasound obviously didn't show a heartbeat, but the embryo was there I saw it myself. Idk what to do, I'm so nervous and I'm trying not to stress to bad about it.