I've been on the pill for a little over a year, and i just lost my virginity two days ago. i'm having light brown discharge today. am i pregnant?

Too early to tell: It Takes a couple of days for sperm to reach an egg in the proper position in the Fallopian tubes. It takes another couple for any conception to move to the uterus & implant. It then takes a few more for that mass to create chemicals that would turn a pregnancy test positive. Your discharge may be related to the sex, but I doubt it has anything to do with pregnancy. STD would be a possibility.