My menstrual last on the 30 of june and my next was suppose to bee on 28 of july but it never came!on the 12th of august I take a home pregnant test and it was positive,then on the 16th of august I saw blood on my pant it was light,then on the 17th of august I wake up with a lower abdomen cramps and back pain I couldn't walk becoz it was very painful.at the night I went to the hospital and doctor tested my urine for pregnanty and it come nagative!but he. Never explain what cause all this pains cause I told him I never had those pains during my menstrual periods!today its 18th of august and am still bleeding not that much but I still have pains!the doctor gave me painkillers but oush it still pains!am trying for a baby so I was having unprotected sex fo the past three months!what exactly is that