Hai, dr Iam 31 old woman,this is my 4th pregnancy,my 3rd pregnancy ,when Iam only my 6 th month aborted my baby,cause of bleeding .my first and second pregnancy are very safe. Now Iam feared about if my 4th baby will abort due to any of the problem.how is the reason of bleeding during pregnancy?in my 4th month of 3rd pregnancy placenta lowered?what is the reason?