Help?

Okay so I had unprotected sex around my fertile window and on my Ovulation day and I’m bleeding but it’s not a lot of blood not even an amount to fill up a pad just circles of blood so clots or nothing and I don’t have any cramps and when I get on my period I have the worse cramps ever the blood started off a brownish and went to light pinkish color idk I’m 17 dpo what should I do?