I am 16.
I had unprotected sex and at first we were using a condom but then I had to go home so he took it off. But he kept putting his penis in for 5 mins after. He was complaining because, since I had to leave, he never got to 'finish'.
So I am assuming he never came. (He was pretty upset)

5 days later I woke up and i have this dark brown liquid in my underwear. It doesn't smell like a normal period and I have been regular for the past 3 years.
I've never been on the pill.
What is going on?
I am really afraid I could be pregnant and if I am, I don't even know what to do.
HELP PLEASE :[