I had sex on 16 of September and the person come in me my ovulation day was 17 of September and I took the pill on the 17 of September after taking the pill my stomach started hurting me after eating meals and drinks and 28 of September I start seeing black blood but it was running light I had sex on 16 of September and the person come in me my ovulation day was 17 of September and I took the pill on the 17 of September after my period normally runs heavy on the first days what is happening????