What Causes Cramps And Bright Red Color Discharge During Periods?

HEllo... About two week before my peroid I wad having slight cramps on and off. I dont get cramps until two days before my peroid. My peroid came on friday the first day it was a mix btw what looked like discharge and a really bright red but very light, the second day it was really light and watery. The third day just spotting. Now I am getting pink discharge. Is this normal?