Tmi no pic what is this discharge?

Laura • 33, UK, expecting my first baby 18 January 2016!
For about a week now I've had itching on the outside of my vagina at the top with a light greenish discharge. Thrush creams don't help. I have a doctor appointment next week but I was wondering if anyone else experience this and what it could be? Any way to find relief until I see my doctor? Thanks in advance