My vaginal discharge was a little green then was normal?

There is no bad smell or odor coming from my vagina nor is it itchy or uncomfortable. I’m pretty sure its not an STD since the last time I had sex was about almost 2 years ago. I noticed it when I came home from the gym. I wore a thong but I don’t think it would matter? After wiping it for a bit My discharge was normal it was white and not green? I’m a little freaked out about this.