Need Help

Sorry if tmi but need some advice about thrush. I have it had it for the past week and it hasnt got any better. Due to the surgery being closed over the easter weekend they are now fully booked until next friday so am unable to see a doctor til then. Was wondering if its safe to use a canasten pessary whilst pregnant as i have one in the cupboard from when i had it last time ( a few months ago) but havent got the leaflet to check. Does anyone know if its ok to use as i dont think ill last another week.

Thanks
Hayley