16.02ug/L in early pregnancy represents a low progesterone value, indicating a possible lack of luteal function, which requires clarification of the cause and symptomatic treatment. Progesterone is a natural progesterone secreted by the corpus luteum of the ovary and is necessary to maintain pregnancy. It helps to stimulate changes in the uterus and increases blood flow to the blood vessels and tissues of the reproductive system, thus promoting embryonic development. The exact value of progesterone can be affected by the size of the gestational week, the means of testing, etc. The level of progesterone in early pregnancy is usually around 25ug/L. If the level of progesterone is low, symptoms such as bleeding, abdominal pain, poor development of the fetus, and in severe cases, preterm miscarriage may occur. It is recommended to seek early medical treatment under the guidance of a doctor.