The possibility of pregnancy with an endometrium of 0.5 cm depends on the timing of the endometrial test and clinical symptoms. If the endometrium is measured at 0.5 cm just after menstruation and is not accompanied by changes in menstrual flow or abnormalities, pregnancy is usually possible. If the endometrium is 0.5 cm in the second half of the menstrual cycle, especially when the period is approaching, it often interferes with menstruation, leading to reduced menstrual flow or even menopause, which has an impact on fertility and should be treated by finding the cause. Fertility is a complex physiological process that requires several conditions, of which the endometrium is particularly important. If the lining of the uterus is too thin, it can affect the fertilization of the egg, sometimes resulting in infertility. If the endometrium is still 0.5 cm when you are about to have your period, you need to undergo sex hormone six and thyroid function tests to rule out endocrine disorders such as polycystic ovary syndrome, hyperprolactinemia, abnormal thyroid function, premature ovarian failure, etc. These disorders can lead to a decrease in estrogen and cause thinning of the endometrium and should be treated accordingly. For example, for hyperprolactinemia, bromocriptine is usually given, and combined pituitary tumors require surgical treatment. If the endometrium is damaged during surgical operations such as curettage or abortion, resulting in thinning of the endometrium, estrogen and progesterone are usually given first to thicken the endometrium. Ultrasound review will be performed after a period of treatment to check the endometrial thickness.