Bf & I had unprotected sex on 10/8/16 so the night after I took the morning after pill. Exactly a week later we had sex again  & the condom broke (a week before my period was due) I got what I think was my period but it only lasted 4 days; normally it lasts 5-7 days & it's pretty heavy up until the last day. I have felt very lightheaded/dizzy & very tired, also nauseous at times. Is there any chance I would be pregnant...