My husband and I had sex 11/19-11/24. My period was due 11/26 and arrived 11/25. It was much lighter than usual and only lasted 4 days when it usually lasts 5-7. Now it's 1 week after my period ended and I am having nausea and some cramping. I had a horrible migraine Monday and Tuesday accompanied by vomiting. I know it's a long shot but I still took a test this AM and of course it was negative. Should I retest in 2 weeks if it is at all possible that I could be? I've also been taking fertility medication for 2 months.