PLEASE HELP ME ANSWER

Samantha
I'm not looking into getting pregnant so im freaking out! My periods have been regular starting on the exact same say since April. In the beginning of September when I'm supposed to start, the day before I had unprotected sex. I did start the next day when I was supposed to. However that period was only three days. Which is weird because I'm usually 5-6 days. After the 3 day period I had no discharge or anything. The week after I had sex everyday for 5 days somedays without a condom. Now two weeks after my 3 day period, I have brown creamy discharge. I'm not ovulating because I usually get a ton of white slimy discharge when I am. I've been having a huge appetite and emotional and sleeping all day. Now I know it's soon to take a test so does anybody know for sure what is going on?