Chance in pregnancy!? :/

On Wednesday the 18th I had unprotected sex with my boyfriend and he came inside of me and yes I know it's not the smartest decision. Also it was my fertil week and it said 33% chance of pregnancy. So is it likely that I can get pregnant??

(Not trying to conceive yet, still in high school)

(Period is due in 11 days)

(Not on birth control)

(Did not take plan b)