If your progesterone levels are not within the expected range with Femara, even when
ovulation occurs, your doctor may want to supplement you with progesterone after
ovulation. Progesterone not only helps with ovulation, but also helps to build the uterine lining. If the lining is too thin, it can cause the egg not to implant in the lining or can lead to early miscarraige.
Good Luck!