Does anyone know of anyone who has gone into labour after inserting a canisten pessary? I have just been prescribed one by the doctor as i have slight thrush and obviously it can get passed onto baby if i still have it at delivery. I got the prescription from the chemist and she told me not to use the applicator to insert the pessary as it can start labour. My doctor didn't mention anything about that what so ever, so i have to put it in with my finger, but what if i don't put it in enough and it doesn't clear, they obviously give you a longish applicator as it needs to go a certain height. I cant understand why the doctor didn't tell me that?!