Hello! I Have A Few Questions. My First Day Of

Hello! I have a few questions. My first day of my last period was October 25th, 2015 and ended on the 30th. I have a pretty good cycle. It occurs 28-30 days until next menstruation. This is weird but I am 15 years old and still a virgin, but one of my guy friends spent the night and we played around on November 7th. I feel like he could have had semen on his hands from when I have him a hand job and then he fingered me... I just started to get a clear fluid like ovulation around November 10th. But it has been 5 days and I am starting to have light pink and dark brown discharge coming from my vagina. I believe that my next scheduled period is somewhere within the week of the 22nd of November. What could this be? Should I tell my mom? Is this something I should be worried about? Is this normal?