Lo Loestrin no period?

I have been on the pill for 2 months now but about 2 weeks ago I was with a guy in bed, he did not penetrate inside of my but his penis went on the outside of my vagina for a second. I am almost sure he never ejaculated either. He masturbated me but that was it. I am on my 2nd placebo day and I still have not gotten my period. I feel signs of it but no blood. Am I pregnant or is it the pill affecting my period?