birth control

So , I got the depo January 5th and that was the first time I've ever had any type of birth control . I never went back n got it Bc I hateeee it ! So I only had it once . Anyways , I haven't had my period this month n I have been having them at the end of the month . It's different this time . It's really light and it's really light in color . It's almost pink . WHAT DOES THIS MEAN ? Helppp 😫