The purpose of this study is to help us determine how hormones impact the production of
cervical mucus which is a fluid secreted by the opening of the uterus, also called the
cervix. During a normal menstrual cycle, cervical mucus changes in response to two hormones
that the ovaries make: estrogen and progesterone. Many of the birth control methods women use
thicken mucus and make it less likely for sperm to enter the uterus. The goal of this study
is to better understand the effects estrogen and progesterone have on the cervical mucus in
the body. To do this, the investigators will be using a drug that suppresses natural hormone
production for 3 months. Estrogen and progesterone will be artificially replaced to better
understand their effects. The investigators will also be studying the effect of a common
birth control pill that may work by thickening cervical mucus. Last, the investigators will
study some of the cells in the cervix that produce mucus.