Swab after taking a Canesten Pessary (for possibly thrush)

I've been prescribed a Canesten Pessary with External Cream and was told to do a swab test and then send it off to get it checked. I didn't think when I was inserting the Pessary and now I'm not sure if it will affect my Swab if I do it tomorrow so it's freshly done before sending it off. Should I wait a week or just do it in the morning and see what happens?

u do a swab first the the pessary

if ur doing the swab to see if its gone id allow a couple of days for the pessary to work