Is it okay to take fluconazole tablets usp (150 mg) during pregnancy?

Yes but: It is used but topical yeast medications are usually preferred. They are available over the counter

Category C: The risk to the growing baby is not quite known at category C, so best to use the creams if definitively needed, but even most the Rx creams carry a category C, and should not be used, especially in the first trimester. Best to consult with your GYN to get an exam and assure the diagnosis and then get the proper treatment safe for you in pregnancy. best wishes.