Still itchy after Monistat 3?

Just finished day three of treatment, as I'm fairly certain I have a yeast infection. My labia and internal area have been very itchy and sore. I think I contracted it from my Nuvaring or a sex toy that wasn't cleaned properly. I used the Monistat 3 day ovule treatment and I'm still experiencing occasional itching. How long does it take to clear up? Should I be cured now that the treatment is done? Or does it take more time.