possibilities? (tmi)

so, two weeks ago I got a positive test. a week later I start bleeding and go to the ER where they tell me that my levels are normal, and sonogram looked fine, but I have O- blood type and my blood was possibly attacking the baby. they gave me a shot of Rhophylac. I went back two days later because the bleeding had clots. and they told me that my levels had completely dropped. I finally stopped bleeding and my cm went back to the creamy yellow color it was before I started bleeding. it doesn't have a smell. could the misscarraige be misdiagnosed? is there a possibility that I'm still pregnant?