The ovulation period is an important period when hormone levels change in a woman's body, and is also a critical period for embryo implantation and development. However, there are factors involved in this process that may affect the thickness of the endometrium, such as menstrual cycle, age, health, and medication use.

If a woman's uterine lining is thicker than 5 millimeters during ovulation, her doctor may recommend further testing to make sure there are no underlying health problems. For example, some excessive increases in endometrial thickness may be due to endocrine disorders or endometrial disease.

In addition, some drugs may affect the thickness of the endometrium, such as anticoagulants, hormone drugs, and antibiotics. Therefore, if women are taking these medications, their doctors may recommend that they reduce their use during treatment to ensure that the thickness of the uterine lining is within a safe range.

To summarize, endometrial thickness during ovulation varies from person to person, but is usually between 1-3 mm. If a woman's uterine lining is thicker than 5 millimeters during ovulation, her doctor may recommend further testing to make sure there are no underlying health problems.