No BC

I dont use any type of BC, and last night my 'friend' and i had sex and he cummed in me and i fell straight to sleep so i didnt even wipe or anything, which apparently has a chance of reducing pregnancy.. And now i dont know what to do because all he said is that i need to 'sort it out' but i cant tell my mum and i'm not due on until the 31'st so i cant even do a test..