Help!!! Need opinions!

Yesterday 6/14 I went to Silver Dollar City. Every time I would get on a roller coaster I would have period like cramps and I would feel very nauseous during the whole ride. I've never had this problem before. My expected period is supposed to be this coming up Sunday. I've had a lot of unprotected sex this month. Could I be pregnant???? (I'm hoping so). Also my boobs have been hurting on and off here lately. Mainly just my nipples