Period again?

How did you ladies know when your period had returned? Did you cramp as usual? I started bleeding again today and my son is 6 weeks. I haven't bled for about 2 weeks now. It's pink and seems like more of a mucous than anything. I'm not cramping at all. Could this still be postpartum lochia? It's not heavy at all either. Very light, just wearing a panty liner.