Weird discharge!

I'm 17 years old and on the depo shot since march 2017. My first 3 months on the depo shot were living hell for me, i was literally on ny period for the whole 3 months with headaches & cramps & mood swings etc. I only had sex once during those 3 months so i didn't have anyone "finish" inside me bc of the whole period situation. Fast forward those 3 months and it's time for my second shot. It's the beginning of June & after a lot of thinking i decided to get the second depo shot. My bleeding definitely stopped but the issue is this. During the first few days i was spotting, then for another few weeks up until maybe July i was really wet down there. There was so much discharge clear & odorless. I had to wear panty liners. I had unprotected sex with my boyfriend and he finished inside of me for the first time ever. He did it twice. My issue is that in the beginning of this month i started noticing a dark-ish green odorless discharge. It doesn't itch down there and it doesn't burn when i pee but I don't know what to do. My mom doesn't know im sexually active & definitely doesn't know about me taking birth control so i'm wondering if this happened to anyone else and what did you do?