HELP!

alydia

hi guys so i had sex multiple times and my partner did pull out but i wanted to take a plan b just in case and this was the first time of us having intercourse. this was also my first time taking plan b. i’m having very bad stomach cramps and back pain and this was a week ago. i also just got over a yeast infection. i don’t know what to do and my period was suppose to start today and it hasn’t . what should i do? do you think i’m pregnant?