What Does Pink Vaginal Discharge When On Anal Drain Indicate?

Hi there,
I recently had an anal seton drain put in (4 weeks ago), this is making toilet trips a hassle.
The last three days I have noticed some pink vaginal discharge, I have also woken with intense itchiness down there. I suspected thrush, but I don't think there should be any blood. I am currently mid cycle, not due until 9/1.
Any idea what it could be. Anything to do with the seton drain?
Regards
Charlene