11 months post baby

I got my period at 4 months post

And for for the last 3 days I have experienced a very heavy painful period .

I was heavy bleeding the first two days to the point where I had to change my tampon ever 2/3 hours before I was bleeding out using a regular.

I’ve never been a heavy bleeder ..

And also painful cramps that are sharp !

What the heck is going on ?