Hello, Four vaginal infections, ranging from common to more rare, can affect pregnant women: bacterial vaginosis (BV), yeast infections, Group B Strep (GBS), and trichomoniasis.Most common infection is bacterial vaginosis, which heals on its own sometime. Never sit around in a wet bathing suit. Wear comfortable, cotton underwear that will allow air to circulate. Avoid tight pantyhose or pants, which can cause bacteria-inducing sweat.