Had my period -- still pregnant?

Hello. My boyfriend and I were "fooling around" seven weeks ago. He did not ejaculate inside me at all, but our genitals rubbed together. I do not believe he go pre *** on my vagina, but that does not mean it is not possible. Fifteen days later, right on time, I got my period. It seemed to be a normal flow, lasting a few days and enough blood to fill up a pad. However, this month my period is seven days late starting tomorrow. My breasts began to feel a little sore today. My boyfriend and I have not had sex or fooled around for the last seven weeks. Still, is there a chance that I could be pregnant or am I simply paranoid? Thank you for your advice :)