s most important functions is to cause the endometrium to secrete special proteins
during the
second half of the
menstrual cycle, preparing it to receive and nourish an implanted fertilized egg. If implantation does not occur, estrogen and progesterone levels drop, the endometrium breaks down and menstruation occurs.
2. Role in Pregnancy: If pregnancy occurs, progesterone is produced in the placenta, and levels remain elevated throughout the pregnancy.