6 months postpartum, cramping, no period?

Jacalyn
so. I'm 6 months postpartum. I bled for 6-8 weeks after having my son. I ended up having a c-section because he was "sunny side up" and his head began to swell. 
I got my first period maybe 3 months after having my son. and every month on or VERY close to the 1st of each month I would get it. I would only bleed for like one day and I would have cramps for a week and things wouldn't be "normal", but it wasn't blood. my milk would lessen A LOT too. 
well..I haven't gotten my period yet this month. I have cramping, but I also have some pain there..no bleeding, no nothing. I don't know if it's just hormones? I did stop pumping last week. my milk was too low and I decided to wean our boy off of my milk and onto formula and food. 
has anyone else experienced this? I'm not pregnant. we've been using protection, and honestly not having sex super often.