Miscarriage or cyst?

Leighanna

I had several positive pregnancy tests even positive blood tests. The HCG levels started to decline until there were none and then I started to bleed and pass clots. Called my doctor and they referred me to the er. At the er they told me I wasn’t pregnant and couldn’t do anything for me. I do not understand what happened and I can’t get in to see my doctor until next week. Has this happened to anyone else?