Here is one knowledgeable kombucha brewer who advises against it during pregnancy, it starts about halfway down.
Quote:
Since the Chinese physicians First Duty is to Do No Harm, then the warning is not to give herbs unless specifically called for. When appropriate TCM herbal remedies, in my opinion, is often superior to their western counterparts.
At this time of development TCM seeks to build and strengthen the mother. Through the mother the fetus is strengthen. The image is one of creation and building. Such as that created by Kefir and Caspian Sea Yogurt or Viili. Good, nourishing wholesome foods. Kombucha Mushroom Tea, on the other hand, breaks stagnation and moves the blood. Kombucha is invigorating. Excellent for those people with a lot of phlegm and stagnation and toxins built up over the years. Not good for pregnancy - which is viewed as a form of stagnation in TCM. One does not want to "purge" a fetus.
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http://www.happyherbalist.com/cautions.htm