confused.

my boyfriend ate me out about a week ago and we were about to have sex and he was rubbing his dick on my vagina im not sure if he atleast put the tip on but im a virgin so im sure i would know?  his dad had walked in so we had to hurry and slam the door then put our clothes on, anyways ive been having these really bad cramps as if im going to start my period for the past 3-4 days and i usually start not to long after i start having cramps. according to this app im supposed to start on the 9th though. is there any chance i could be pregnant?