BV / discharge.

So from research on here and also google it seems I could have yet another BV. My discharge is thick light green with no order and slight itching (but I had a cut on my clit and I kept itching at it so I'm thinking that could possibly be that?) I ruled out pregnancy and STD. I'm on birth control (nuvaring) and I know my boyfriend is faithful to me. The doctor once gave me Metronidazole gel. I still have it. My question is should I do a treatment with it? I'm trying not to go to the doctor due to having no time to go. Do you think that's a good idea? 
PS i got my period may 25th and literally 2 hours before my period I got this type of discharge. Then today the greenish discharge came back. I used tampons