Discharge-period or early pregnancy?

So I’m 5 days late for my period. My period isn’t perfectly regular, it’s been off by a week or two before and I’ve rarely gotten my period on the predicted start day. Still, I’m a bit nervous and the pms symptoms I’m experiencing (tender breasts, fatigue, constipation etc.) I’ve heard can double as a sign of early pregnancy. Today I’ve noticed my discharge changed color. Could it be a sign that I’m starting my period soon, or is it possibly an early sign of being pregnant?