Green discharge in DEPO shot

I got on the depo shot about a month ago and i'm not a virgin. The last time i had sex was in april so there's no chance of an STD and i've never done anything else sexual in the last month. There's no iching and a little bit on a smell. The thing is that i got the shot at planned parent hood so my parents don't know i got the shot and i feel like if i go to a doctor my mom would figure out.