Confused?? HELP.

I'm 7-8 dpo & I've been cramping ever since ovulation but not bad. I just went to the bathroom & had very light pink on the toilet paper only twice tho. AF isn't due till the 17th so what could this be?? I've never had this before. The only other thing could he is I've been extremely tired since ovulation as well but nothing else. I do have irregular periods but I don't have it this early before AF is due usually only the day I start.