I have experienced this and it could be the hormones changing the acid balance and making you feel a bit irritated, not thrush.
When you are in the infertile period the cervical secretions are hostile to sperm and perhaps the hormonal change that prompts the cervix to make the sperm friendly mucous affects your ph balance. I have also had this irritation just before my period for a couple of days.

I also get thrush (not for a long time...touchwood) and it feels different to this irritated thing even if it lasts a couple of days. Get yourself off to a Dr quckly if you suspect it is thrush though to rule it out.

Also you can have "practice mucous" which IMO is so darn confusing and only in hindsight do I know when that has happened.