slightly yellowish/greenish discolored discharge?

I hope that i'm just being paranoid, what does it mean if vaginal discharge is thick, sticky and slightly yellowish/greenish discolored? Very little discharge actually comes out, but if I go inside and pull my finger out then I can see the discharge. It's not excessive and it doesn't smell. I took the Vagisil home screening test and it shows a normal pH, I also tried the UTI that shows signs of LEU's and that came up with traces of LEU's. Oh and my period is due to start next week.