Period

So I’m 9 months postpartum and have only had my period twice since having my baby first one was about 9 weeks after baby and lasted 2 weeks nothing bad I’ve now had my period for 18 days and it’s been heavy for the last week even had loads of blood clots it’s getting to the point where I’m so annoyed it hasn’t gone I can barely do anything without it gushing out when I stand so I’m constantly trying to sit down as much as I can any advice? Or if this is normal cause idk