Sickness

Nancy
Ok so I stopped BC on October 7th. Which was the third week before my period was due. Got my period on the 13th and now I'm on day 41 of my cycle. I have taken several tests and all negative. Last Tuesday and Thursday I spotted a little And thought my period was coming. I've been feeling nauseas. I'm convinced I'm not pregnant afters test after test and all negative. Someone please any thoughts?