Hi. On the last week of September, my bf and i engaged in (i wouldn't call it sex because there was no insertion and we both had our undies). On the 8th of october, i had my period but it wasn't as heavy as before. It lasted 6 days. The flow was unusual because i used to have a heavy flow. Now, i am 4 days late. Is there a possibility of pregnancy? Pls help. I'm scared