Understanding what an endocrinologist does begins with understanding what the endocrine system is. The endocrine system is a series of glands that produce and secrete hormones that the body uses for a wide range of functions. These control many different bodily functions, including: 1  Respiration.
Most ovulation tests may be used at any time of the day; some suggest testing first thing in the morning, although this is not required. For greater success, test about the same time each day, and reduce your liquid intake for four hours beforehand.
One more thing: the nurse mentioned that the test would indicate whether you ovulated or not. That is not the hCG test, but the progesterone test, typically done 7 or 8 days after ovulation. It is not an indication of pregnancy, but of ovulation.