Anyone have spotting before their first postpartum period?

I have had spotting for the past 6 days. I thought my period was coming but so far nothing. I am 11 weeks pp and was breastfeeding but due to a low supply and baby not gaining enough weight, I started supplementing with formula. I am weaning now as my supply has dipped even more so could the spotting be from weaning? Never had spotting with my first!