Like others have said, every pregnancy is different. With my first 2 I didn't get my period back until some time around the 6-7 month mark. My postpartum bleeding didn't last much past 6 weeks. By 6 weeks it's was mostly off colored discharge. With my third I kept spotting on and off and the bleeding would pick up and stop the whole time, I had a full fledged period a few days after 6 weeks and had them ever since. They have been very erratic, they were anywhere from 16 days between to 30 days between. I would skip random months if she got sick or went through a growth spurt. and nursed more. I didn't do anything different. They were all nursed on demand, never pumped, never supplemented, didn't rush solids.
Also after a D&C it takes your body time to re-regulate itself. I know they tell you not to try to get pregnant for 3 months after one because it takes at least that long for your body to rebuild the lining it should have. Since you're breastfeeding it's even harder for your body to build that lining back up and begin ovulating again.
I say enjoy it while it lasts!