spotting

Ni
I'm 7 months pp and still EBF my LO. I had my cycle return on Dec. 20th for 4 days and then nothing again until this past Monday. I've been spotting but it's brown, from what I've read maybe old blood? Is this normal for breastfeeding momma's? I'm a FTM so spotting brown for 5+ days had me concerned. Advice?