Generally ovulation monitoring begins on day 10 of the menstrual cycle.
Ovulation in women with regular menstrual cycles mostly occurs about 14 days before the onset of the next menstrual period, and is usually monitored starting around the 10th day of the menstrual cycle to observe changes in follicle diameter; mature follicles have a diameter of about 18-22mm, and the follicles disappear after ovulation. Continuous monitoring shows that follicles are increasing in size before ovulation, and ovulation is suggested to have occurred when the largest follicle disappears.
Ultrasound monitoring of ovulation must pay attention to the continuity, can not stop monitoring as soon as you see a mature follicle, we must continue to monitor until ovulation occurs, in the ovulation before and after the guidance of coitus can improve the chances of conception.