Plan b/ ovulating

Hey pretty ladies ! I need help!! Me and my friend had sex around 7 something this morning ( 7/22/18) and the condom broke and he cummed in me . I took plan b around 4 this afternoon so it was less than 10 hours but according to glow it was 27% chance of pregnancy so I don’t know if I was ovulating today or tomorrow or something so I’m just scared I’m gonna get pregnant and that the pill won’t work