Pink discharge?

Today is the due date of my period and I was having cramps all day today and normal PMS symptoms all week, but then I've only had a pinkish discharge so far. I also am not pregnant because the last time I had a scare in June, I took an emergency contraceptive, and I've had my periods since then and they were very steady periods.

I'm a bit of a hypochondriac but is this anything I should be concerned about? Or could the emergency contraceptive be messing up my cycle in any way? Thank uuu