nexplanon bleeding

Kiara • ~🥰Momma to 2🥰~
I've had my nexplanon in for over a year and I've had no bleeding. Now all of a sudden I've randomly stared bleeding heavily, I assumed it was my first period since having my daughter ( who will be 18months soon) but I'm still bleeding 3 weeks later. Someone please explain whyyy I'm tired of buying pads😩