The doctor will issue a report card when the follicle is measured by ultrasound, and this report card is looked at in this way. The first description is the description of the uterus, including the size of the uterus, the thickness of the endometrium and whether there are abnormal echogenicity in the uterus. The second description is for the adnexa, including the fallopian tubes and ovaries, to see if there are abnormal echogenicity and if there are follicles developing, and if there are follicles developing, the location and size of the follicles and the measurement data will be indicated. Finally, there is the lower ultrasound cue, which will indicate whether there is follicle development on the left or right ovary. Because the follicles will grow 1-2mm per day and reach 18-25mm in diameter at maturity, you can have intercourse when the ultrasound shows that the follicles are 18mm in diameter. If the mature follicle disappears from the ovary, it means the follicle has been ovulated, which means the ovulation function is normal.