Period again?!

To start, I did not get my period throughout the month of September. My period however started extremely early in October 2-8. I had rough sex with my BF about 4 days ago. When we finished I had bad stomach pains. Since then I have been okay. I thought I had to use the bathroom. For the past 4 days though I have been bleeding. The night of the sex I wiped watery blood away. The 2nd was the same. Yesterday in the morning I used the bathroom and wiped myself to find some blood with discharge. In the night I had light cramps and found that I had bled. Just in case it happens randomly again I put a pad on. Now I'm officially bleeding (had a huge blood clot come out). Also. these are my fertile days. I don't understand what's going on. Is this normal?