1. The layer of the uterine wall that is shed during menstruation is the A. endometrium 2. The hormone that works with estrogen to prepare the endometrium for implantation of a fertilized egg is. A. ADH B. FSH c. LH D. progesterone 3. The average menstrual cycle is days. A. 14 B. 18 C. 24 D. 28 4. A woman is most likely to get pregnant when A. after they are 35 B. on day 14 of the menstrual cycle C. around Christmas time D. when they have taken the contraceptive pill