I'm 17, I had a miscarriage last month due to my reproductive organs not being ready, my ob thinks I'm pregnant again, what are the chances of another?

"Say it ain't so" Dr. If your OB MD thinks that you might be pregnant again then the chances are very good. I hope that isn't the case as you just had a loss of red blood cells and a pregnancy and have not yet had time to physically or emotionally recover. Hopefully, you have discovered the reason for repeated pregnancies, -hint unprotected sex is "connected" to the answer.