I Missed One Birth Control Pill In October. The Pharmacy

I missed one birth control pill in October. The pharmacy switched my brands of medicine this past month. I have not had a period yet and I am due any day. My boyfriend and I had sex on November 3, 2016. He did not cum inside of me. We only did it for about 3 minutes. Could switching the brands of medicine make me miss a period or could I be pregnant? I don't really have any symptoms like sore beasts, gaining weight, craving food, vommiting, feeling tired, or anything else.