Period/Pregnant?

I started Birth Control the week of Dec23rd (monday) and i had unprotected sex Jan 1st (which meant i was in the first pill of the second week) i had to stop the pill though so i never got to finish it. My period suppose to come in like 3 days. Is it possible i could be pregnant? i get alot of discharge and diarrhea (idk if my mind is playing tricks on me) but could there be a possibility im pregnant? I know some say after ovulation the chances of pregnancy drop but im still nervous