Maybe starting period?

I’m 6 weeks postpartum and I have started to bleed lightly again with brown discharge, could it be the start of my period? I’m exclusively breastfeeding right now, but me and baby girl were also given the clear to sleep through the night and she is sleeping all night. I’m not really on a strict schedule to feed her, she usually eats about every 2-3 hours all day. I just thought breastfeeding moms took a little bit longer to get there period?