Help, ?

Nykki • 19, Awesome
So for the past couple of months, glow had been SPOT ON with my period and ovulation days, && according to my schedule for this month, my period is Twp days late. Normally I wouldn't panic, but lately (starting Saturday) I've been experiencing mild cramping (not everyday, started Saturday, didn't happen again until today) && I just accounted it to my upcoming period. But I noticed yesterday that I have a watered down whiteish discharge that is getting more and more frequent. I keel thinking it's my period, and it isn't. Has anyone else ever had this happen ? Does anyone know what this is ?