Hopefully the canesten will relieve the problems for you!
But there is a chance it will return - canesten kills the excess yeast, but since the conditions have not changed, and there is nothing to "replace" it, in a sense, you could very well end up back with the same issue. The vaginal pH changes during pregnancy, making the environment much more friendly for yeast, so it is much more likely to grow out of control. (there is always some yeast present - it's just balanced by other things too.) That's why the other measures might help more, long term. The yogourt or acidophilus provide the bacteria that can counter the yeast, and prevent it from growing out of control. The reduction in sugar and white flour lowers your blood sugar (I think!?) so that there is less for the yeast to feed on. And, staying as clean and dry as possible also prevents the environment from being too favourable for yeast growth. (It likes warm, dark, moist environments - obviously there's only so much you can do in that department, but every little bit helps! )
Wish you all the best for finding a good solution!