I've been on birth control for 2 months, I got on it right after me & my bf first had sex. About 2 weeks ago I got staph infection and had to stop taking my birth control while i was on antibiotics(it cancels the b.c. out) for 10 days. i didnt have sex at all during this time because i had started my period. after my period ended i started back up on birth control and have been taking it for a week now. me and my bf have had sex 3 or 4 times in this week. 2 days ago I had this strong, persistant sensation that i had to pee, but when i went to the bathroom, it hurt(burned sort of) and i hardly pee'd at all. yesterday i felt queasy all day and didnt intake anything besides water and cranberry juice, about 6pm i got really nauseous and threw up nothing but water and this yellow solid stuff(no idea where that came from) do i have anything to worry about?

PS we never use condoms.