bleeding after postpartum bleeding

okay so i have a question that might contain a bit too much info

I gave birth on may 28 and then bled until july 1st
i had my postpartum period july 1- july 7
i went to my doctor to have my six week checkup on july 10
about two days later i started slight spotting and now its about a week after (july 20) and im bleeding. but its alittle bleeding and its like a dark reddish brown color...

is this something to be worried about? has this happened to anyone?
or better yet- does anyone know what it is?