Lately I've been feeling something stirring or grinding around my uterus area. This would usually happen before I get my period, but this feels more active. I've been feeling nauseous with bad headaches at certain times of the day, and I've also notice stringy vaginal discharge when I pee. I took a pregnancy test, but it came out negative. I don't expect to get my period until after the 13th of this month. I used to take birth control pills, but I stopped around october 24th because apparently I missed a couple pills which lead to an early period during the first week. I have had unprotected sex since then. Could I be experiencing pregnancy symptoms or are these just effects from getting off the pill?