4 wks postpartum, not breastfeeding. After bleeding stopped 1.5 wk ago. Now have cramps and brown blood. Is this my period coming?

Possibly. Typically the first period when not breastfeeding is 6-8 weeks after delivery. However, some women do experience their first period sooner than that, even if the bleeding right after delivery continues for 2-3 weeks. This cramping and bleeding could be the start of your first period or simply your body's response to the shifting hormones after childbirth.