Long period after baby

Maricela

I am almost 3 months postpartum. I have already had my first period after baby. I started my period again on October 1st. Just when I thought it was going away it hasn’t. So now I’ve been on my period for 15 days. My periods last 6-7 days always. I got back on bc last month. I thought maybe that’s why, but even in the past with or without bc my periods remain the same. Should I be worried? Has anyone else had this happened to before?