pregnancy percentage

so my app currently says: chance of pregnancy 9%. And the percentages didnt pop up til i logged that i had sex. Does that mean if i have sex there is a 9% chance i get pregnant or does it mean that there is a 9% chance that i am pregnant because of when i had sex...because a couple days ago it said 7%. I logged i had sex on sunday and that same day is the first time i saw the percentage and it freaked me out...