With an endometrial thickness of 15mm, a few can be implanted and most are not easily implanted. The endometrium is relatively thick at 15mm. A thick endometrium is not conducive to fertilization and requires diagnostic curettage or hysteroscopy to rule out any endometrial lesions such as endometrial polyps, small submucosal fibroids or atypical endometrial hyperplasia or complex hyperplasia. A too thick endometrium is not easy to conceive and can also cause endometriosis and vascular bleeding during menstruation when the endometrium peels off. If the endometrium is 15mm thick at ovulation, the doctor will recommend progesterone to convert the endometrium to secretory phase as early as possible so that the endometrium will not be too thick and bleeding will not be excessive during menstruation to avoid the occurrence of anemia. Generally, the endometrium is 8-12mm thick, with an average of about 10mm, which is easier to bed down. During the secretion period, which is the 14th-28th day of menstruation, the endometrium will grow to a thickness of 8-10mm or 12mm, which is more suitable for conception. When you are ready to conceive naturally, you can temporarily skip checking the endometrium without abnormal bleeding and just observe.