Could Spotting After Giving Birth To A Baby Be Start Of Menstruation?

hi there, im 23 and just had my first baby. vaginal delivery, everything went great. it has been exactly two months since i gave birth. i only bled for about 3 weeks afterwards. this morning i noticed some brown spotting but only when i wiped. could this be the start of my menstral cycle again? i do breastfeed about 4 times a day and i give formula in between breastfeeding.