Confused? Help(:

So when I ride rides I NEVER feel sick, ever. Tonight I was at the Lancaster fair & I rode almost all the rides. I felt like I was gonna puke on every single one, even the Ferris wheel. I have had some pregnancy symptoms. My last period was Septmeber 12, 2015. & I had unprotected sex onSeptember 26, 2015. ( which was my ovulation day ) then on October 2nd, 3rd, & 4th. ( all times my fiancé never pulled out ) I got my " period " on October 7th 2015 BUT it was very light if that & only 3 days. Normally they are 7-8 days.