Horrible cramping cd4

A.💕
So I'm on cd4 but if you count the two days of spotting cd6 and I'm having HORRIBLE cramping! I usually have mild cramps on the first two days of af this time I didn't but good gracious it's like I'm about to start all over again! My flow has been pretty light today as if it's nearing the end of my period... Anyone else have this?