Endometrium

During a woman's reproductive years the lining of uterus, the endometrium,  changes through cycles of growth, maturation and shedding. All of these changes are dependent upon a normal hormone balance by the functioning ovary and controlling glands. The endometrium  thickens in the early phase succeeding menstruation as a result of glandular growth.

The endometrium is one of the most dynamic organs in the body. Physiologically, the endometrial thickness has a wide range. It can respond to an endocrine environment by an increase in thickness in preparation for implantation or by sloughing its lining in preparation for a new cycle.

The endometrium is the layer in which the implantation takes place. This layer experiences morphologic and functional changes that are closely associated with the cyclic release of female reproductive hormones.

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https://femelife.com/ivf-fertility-care/implantation-ivf-success/