I just threw up for no reason..?

Okay, so I'm 15 and I have been on birth control since the end of February. Yes I have been having , the last time was about April 3rd. I always get my period between the 20th-26th.. But last time it came 2 days after I had .. Uhmm, lately I've been feeling more likely to throw up but I never have until about 15min ago. My temp. is 99.1 if I'm away from the fan I get really hot but if I'm next to it, I get really cold. I felt fine til I woke up today. This is weird to me I doubt I'm pregnant, but should I stop taking the pill for awhile and see what happens? Or what? Ohh yeah, I'm also shaking pretty bad..