The vaginal microbiome plays an important role in influencing pregnancy outcome. Dominance of the vaginal niche by Lactobacillus species has been widely reported to be associated with a healthy, full-term pregnancy, specifically Lactobacillus crispatus. In contrast, diverse microbial communities depleted of Lactobacillus species and enriched with bacteria associated with Bacterial Vaginosis; a clinical syndrome characterized by vaginal discharge odor and polymicrobial overgrowth, increases the risk of adverse pregnancy outcomes including miscarriage and preterm birth. Preterm birth represents a significant global health burden.