Hi, my question is OB/GYN related. My menstrual usually lasts 4-5 days and on a 33 day cycle. This month (5/22/14) menstrual began & remained very light for about 6 days accompanied with minor cramps towards the end. A day or two after it was over, still cramping, began spotting (only when I wipe), lower back pain, small clot ( fingernail size) when using restroom. That day took HPT to rule out pregnancy, which was negative. To this day I m still cramping & spotting on & off. Is this some type of infection? Please help! Thanks in advance... Very concerned