PP bleeding or period at 4 weeks?

Mina
I'm about four weeks pp now and I thought my pp bleeding had basically stopped, it had gone down to spotting maybe once a day and being brownish white. Yesterday I was getting more dark brown/red bleeding that was very thick but not heavy, but today when I woke up I found I had bright red bleeding which has continued all day. I am exclusively breast feeding on demand and thought that you normally don't get your period for at least six months when doing that. Is it possible that I got my period already or could my pp bleeding have just come back with fresh bleeding? I haven't been more active lately or anything that should have stressed anything out.