Food posioning or pregnant?

Yesterday I ate some stake n shake a burger and fries n I took 3 pain killers.my period is due later on today n I been throwing up like 3 times this morning now im fine my friends ate the samething except they took 5 pain killers and they fill fine I took these b4 I also havnt had no cramps yet like I do b4 I start my period be honest what do you think....i been using condoms n avoiding ovulation days I messed up one day tho I feel so dumb I dnt like the side effects of birthcontrol I sm married tho but we jus absolutly cant afford anothet baby I have two boys I want anothet (a girl) but not for like 5yrz or so n I dnt want marina cuz of bad reviews n im feeding so cnt use nevera ring n smells are really making me nauseated today.wat do I do if I am pregnant and cant afford it I jus turned 20