As an ObGyn practice you have a great opportunity to reach potential patients at the start of the decision process. Whether is a woman who just found out she was pregnant and starts researching pregnancy or looking for a due date calculator. Maybe they are looking at early signs of pregnancy or pregnancy symptoms because they just suspect they are pregnant.
By being the source of education to those searchers you become Dr. Google giving you a serious leg up on other practices. There are many many searched each month for Gynecologist, Hysterectomy & menopause each.