The Centers for Disease Control and Prevention has deemed Monistat 7, or miconazole, safe for use during pregnancy, states the manufacturer. The CDC recommends seven-day, topical treatments featuring azole drugs, such as miconazole and clotrimazole, as these drugs do not pose a risk of birth defects or other complications.
Yeast infections are caused by an overgrowth of candida, according to Mayo Clinic. The significant hormone changes during pregnancy can upset the natural pH balance of the vagina, making pregnant women more susceptible to yeast infections. While uncomfortable, yeast infections don't typically cause any negative effects on pregnancy. Mayo Clinic recommends confirming a diagnosis with a health care provider before beginning treatment of a yeast infection.