Greenish discharge but not uti

Hi mummies, anyone got greenish discharge but not uti? Doctor told me it's not uti but he prescribed me antibiotic for precautions. I've been taking it for about 2 weeks now but still having the greenish discharge. It looks like yeast infection but i got yeast infection before and it didn't take so long to go away..this time it's taking too long. Do i have to worry about it? I'm 28 weeks.