I had a light 4 day period 7 days after unprotected sex, and a week early. I have had pelvic discomfort, leg cramps, been tired, nauseous, minor dizziness and headaches. I'm not due to ovulate, so its not that and I've gotten 2 negative hpt's one being today (19 days after intercourse). I fear it may be ovarian cancer or something....please help