What Causes Abdominal Cramps And Dark Menstrual Bleeding?

.I started my period the 5th or 6th and it lasted around 8 days , during my fertile window or whatever I had unprotected sex twice and was supposed to ovulate this Sunday that just passed and ever since monday I ve been bleeding , it started out as light pinkish reddish spotting an progressed into dark brownish blackish blood with stringy clots and I ve been having abdominal pain and cramps , sometimes I ll have a pain in either sides of my pelvis , now the bleeding is dark red an still clumpy like , I ve been having to change my tampon every hour an half or so. I started my period for a week , quit bleeding for about a week an now I ve been bleeding for a week. I m tired and moody , I ve been hurting..