Constant light bleeding after depo

I’ve been off the depo for a month and have had constant light discharge. I only notice the slightly pink/ brown discharge when I wipe. It’s hard to see. Lately I will have more of that discharge after sex and it goes away within a day or so. I only had one shot of the depo on May 12th. It’s been hard to know if I’m on my period or what with the light discharge. I am having a hard time tracking where I am at in my cycle. When should my period go back to normal?