Is my girlfriend pregnant im only 15 help?

we have often i know im young and should wait but anyway my condom poped like a mont or two ago but we got plan b the morning after...weve ****** before with no condom but pulled out and only for like 5 min nothing long...so anyway last week she threw up like 6 times on thursday she claims she took a wrong pill that she thought was a pain reliever so it made he sick...idk and for the last 3 days she said she has a headache? and she only threw up for thur no outher days after tht