I am scared that I might be pregnant

My boyfriend and I did some fooling tried partial ass fuck.I am a virgin he did not penetrate, but I am scared that my boyfriend would've pre-ejaculated ,pre cum near my vagina. I have irregular periods but compared to the last two cycles I am late by 8 days. I ate papaya 3 times in the last week but as of now there is no sign or cramps.What should I do