I Am On Microgestin Fe 1/20 And Take It Regularly,

I am on microgestin fe 1/20 and take it regularly, never missed a pill. recently, i had my most light period, only lasting for a day. It was barely menstruation because of it being light. I was sexually active a few weeks ago, but not "fully." I didn't have full sex, it was mainly foreplay without a condom for only a few seconds. I doubt that I'm pregnant, but what do you think?