Whether follicle 0.5cm is normal or not depends on when the patient’s menstruation is due when the ultrasound is done. Normally, the follicles inside the ovaries start to develop only after the menstrual period, if it is the follicular phase, the size is normal at this time, and when ovulation occurs, the maximum follicle size can reach 18-23 mm. if the follicle is still so small after the 10th day of the menstrual period, it is not normal, if the follicle is found to be so big after the menstrual period, it is normal. The follicles develop gradually as a woman’s time increases, so a single check of 0.5cm follicles does not indicate anything, and it is necessary to go back to the test after 2-3 days to see the growth and development.