spotting a week after period.

Lilly • 19 years old. married march 3, 2015💍💑miscarried twins may 8, 2015. 👶🏾👶🏾expecting baby #3 march 2016. 💞👶🏾
so i had my period feb 11-16. my cycles are usually 33-35 days long. ive had light pink spotting yesterday & today. ive never had this happened to me. i  am also breastfeeding. anyone have this happened to them? what could it be?