Pregnant????

So me and my SO had sex and he came in me but I’m on the pill can there be a chanse I might be pregnant this happend Friday...I’m suppose to get my period this week, if I get this period I’m not pregnant if I don’t I am....I been on the pill for 2 months, and I never skipped or missed a pill only once or twice I took it 2 hours later. Also I been having lower abdominal cramps for like a week but they are mild and I been nauseous for the past two days....it could be I’m just freaking out but I need answer please help !!!!!