Please explain anyone

So I ovulated 21-27 and we did the bd everyday and then two days ago I wiped and had light pink on the toilet paper all day so someone said it could be implantation and now I'm two days away from my af and I started cramping real bad today and I don't normally cramp til I actually start ... And I'm also having a lot of pain in my lower abdomin 
Could I still be pregnant or no 
Has anyone experienced this