Period?

Last month on 29 had some spotting only did two times when id wipe stopped that night next day the 30th it was very light pink once then went to a brownish then stopped well today had a bit of brown twice but only a little then again stopped. I am 2 month postpartum now have had unprotected sex since last week of august. Wondering if other mommys have had this? never had it after my son all my periods have always startsed out very heavy