Spotting

Carole • 🌸💕
So I've posted about this problem before, & I'm really starting to get frustrated. 
I had unprotected sex on the 11th, was supposed to get my period on the 14th. But AF was a no show. The only thing I've had is really sensitive nipples & mild cramping. & today when I went to the bathroom, I noticed there was like this pink-tannish color discharge. But it was very little. Just went to the bathroom again & it's more of a light pink now. 
Am I starting my period or is this something else?
If I don't get my period by tomorrow I'm going to take an HPT