Okay,January 19,2013 I had unprotected sex 3 days before my cycle and he came inside me multiple times,but the twist is,I got my cycle,had a full five days as normal,just lighter bleeding and one day of mild cramping,and lately i've been sleeping alot,feeling nauseous,always hot,and having frequent headaches.Could I be pregnant,my mind is playing tricks on me,or ovulation is occurring?