Sure, eating yogurt alone won't cure an infection, but it can help in preventing another by keeping the area "colonized" with the good bacteria and keeping the other kinds of flora in check.
I found a probiotic supplement at the store yesterday called Femdophilus, made by Jarrow. It claims to have specific strains for the urinary tract and vagina and the Dr.s who patented it have done studies where the good bacteria in those areas were raised substantially in a week with women who took the supplement.
I bought the capsules and have started taking them, in addition to the garlic placed in the vagina. Some mentioned how putting plain yogurt right in the vagina can help cure a yeast infection--this kind of probiotic reaches the same place, but you can take it internally, meaning less mess. Hoping it's easier and effective. For itchiness externally, try the monistat (miconozole) or lotrimin cream at your local pharmacy if the coconut oil is not quite cutting it. It's quite safe to use externally while pregnant.
My midwifery book mentioned that due to the higher progesterone levels, the alkalinity of the vagina is raised, making infections more likely. (Nice to know it's not always b/c of diet, right?!) Taking a regular probiotic (or eating yogurt) as well as drinking unsweetened cranberry juice (which can "acidify" the vagina and UT making it a place that is more difficult for the bad germs to grow) can help to prevent recurring infections.