Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

Dr. Kimberly K Martin - During the monthly menstrual cycle, the uterus lining builds up to prepare for pregnancy. If you do not get pregnant, estrogen and progesterone hormone levels begin falling.

The tissue from Case 2, partial endometrium

Decidual cast from a woman - Stock Image - C058/5454 - Science Photo Library

How Can I Make My Uterine Lining Thick and Embryo-Ready For Implantati – Bird&Be

Cervical Stenosis - Women's Health Issues - Merck Manuals Consumer Version

Oviduct - an overview