am i pregnant?

On 2 june i had sex and he has finished on my belly, i dont know if the sperm went down on my vagina but if it did there are chance of pregnancy? I m sure i wiped off everything with a towel in maximum one minute after he cum on my belly but i think the sperm might got on my vulva or maybe even in the proximity of my hole, despite the fact that the menstruation is late i don t have any other simptom(and also i have irregular menstruation, i m very stressed because of my exams and my sleeping schedule is unusual because i began to learn at night and sleep on daylight)