The endometrium is 13mm during ovulation

However, for women who are not planning to have children, the thickness of the endometrium is also a factor to consider. The thickness of the endometrium can be measured on day 14 of a woman's menstrual cycle. In this case, if the thickness of the endometrium is 13mm, it can be said to be a very thin endometrium.

So, why is the endometrium 13mm considered to be during ovulation? This is because during this period, a woman’s ovaries will release a large number of eggs, and these eggs will enter the fallopian tubes to wait for fertilization. If a woman's uterine lining is very thin, it may interfere with the passage of these eggs, making it more difficult to get pregnant.

In addition, if a woman's uterine lining is very thin, it may affect the formation of a fertilized egg. In this case, the fertilized egg is unable to enter the uterus and implant on the lining of the uterus, resulting in an inability to conceive.