Hey I actually just got over it, it was horrible. My second one in three years, I hate it.
I'm on antibiotics and my doctor said if I developed a yeast infection to take canestan tablets, she said the ones that you insert vaginally are safe for pregnancy, the ones you take orally are considered "Class C use with caution" while pregnant as they don't know the affects on pregnant women.
Also this is going to sound super weird but it's what I did to get over my last one, and it is considered safe while pregnant. It REALLY helped. You take a clove of garlic (peeled obviously) and insert it in your vagina at night and leave it in overnight. Some websites say to just pop it in but I wasn't comfortable with that so I wrapped it in gauze and then tied a tampon string (unflavoured floss would work as well) around it and inserted it. Then I had a way to easily remove it. Honestly it relieved the itching IMMENSELY within an hour, and it also works to cure the infection as garlic is considered an extremely effective antifungal. I was amazed. I also read about inserting plain yogurt and also using it as an external cream, but at the time I only had garlic available.
Another thing I did overnight (because that's when the discomfort was the worst for me) was wrap an icepack in a towel and put it between my legs. The cold kind of numbs you and relieves the itching, at least enough to fall asleep.
Hope this helps!