So on September 13 me and this guy hungout in the movie theater, we started messing around and I jacked him off he ejaculated into my hand, I wiped it on his pants (I don't know if I got all of it) then I touched myself through my jeans, after that we watched the movie it was about 2 hours long, then when I went home I directly touched myself ). A couple days later I started to feel Nauseous and got headaches and small faint back aches but then I got my period( it was very light and brown)( my period has always been irregular since it started when I was 12 I'm 17 now, I skip months all the time so it's hard to tell when I get it and when I don't), and now recently I've been getting the same symptoms and brown discharge( I've read that brown discharge happens during early in pregnancy in place of your period) I'm very confused and paranoid. Could I be pregnant? If not what could be wrong?