Hey...during my pregnancy I had real bad trush......and OB said canesten is perfectly fine to use....he even told me to use the pessary/tablet thingy a couple of times (just not to put it too far up with applicator).....but the relief would only last a few days, and I soon learnt (unfortunately) it was something I had to put up with!!
It went away as soon as DD was born \/ \/

goodluck!