Spotting????!

So this has been going on for the last 5 months every cycle. I had my daughter almost 8 months ago and my period returned at 2months pp since then they have been close to normal length (36-30) but I'm spotting a lot during the cycles it's always 1-2 weeks after AF but (TMI) it changes colors to very light pink, orangish, brown, burgundy through the day. It lasts only a day usually and it can happen 1-4 times a cycle.