Vaginal infection?

Last week I went to the doctor and got a cream for a vaginal infection which had seemed to clear up. My discharged which was white and clumpy cleared up and became normal over the weekend. However today I noticed when I went to the bathroom that I had a yellow/green discharge that was translucent. I am not sure if I should contact the doctor or continue using the cream for another day or two and see if it comes back again? Is it possible that it could be old mucus or even DH sperm?