I have a misshapen uterus due to a birth defect and may have endometriosis (I have symptoms, but have not had the laparoscopy to confirm). I normally have regular periods, but I'm now 29 days late. I have veiny and sore breasts, nausea throughout the day, food aversions, and cravings. My long-term boyfriend and I are sexually active, so we took a pregnancy test and it was negative. If it's not that, then what else could it be, and could a test be wrong when I'm now late for a second period?