What Can Cause Delayed And Light Periods?

Hi, Im about 2 and a half weeks late. I thought I was starting 2 days ago because I had very pinkish when i wiped. But when I woke the next morning it was a few spots. Nothing the 2nd day but just light brownish when wiping and yesterday and today extremly light pink but not enough for a pad. I've also had mild cramps on and off for over 2wks.