Eh, keputihan kuning ni memang kena check dengan doctor dulu sebab bisa jadi bacterial vaginosis or infection lain, tak boleh self-diagnose je! Dari pengalaman few of my mum friends, yang insert ubat metronidazole tu memang biasanya keputihan improve dalam few days, tapi ada yang masih sikit-sikit lagi depending on severity dan kena complete the full course of treatment, so make sure follow doctor's instructions exactly and go back for follow-up if it doesn't clear up completely.