Depo injection Help

Ca

Got the depo injection on the 29th December, Had my first bleed since having my little girl 5 months ago on the 18th January and I'm still bleeding. I've been bleeding for 3 weeks now which isn't normal for my body. I've had 2 kids with my oldest my first period wasn't as bad as this and didn't last as long, Has anyone else had prolonged bleeding on the depo months after having a baby. Due my second shot in March should I continue in hopes the bleeding will stop or do I come off it completely and go on a different birth control