After the follicle is 15 x 12mm wait about 4 to 5 days for the follicle to mature and ovulation may occur at any time.
Normally, from the 5th day of menstruation until the follicle matures, the main follicle grows an average of 1.5mm per day, and the closer you get to ovulation, the faster it grows, and by the time you get to about 4 days before ovulation, it grows an average of about 1.9mm per day. So after the follicle is 15 x 12mm wait about 4 to 5 days for the follicle to mature.
Ovulation is accomplished by the joint synergy of the pituitary-hypothalamus-ovarian axis. If mental tension, work stress, depression, dietary disorders, environmental changes, and staying up late may affect normal ovulation, the exact time of ovulation may be deviated.
Follicles 15 x 12mm, need to continue to monitor the follicles under the guidance of the doctor, the doctor according to the specific follicular development, to formulate individualized pregnancy preparation program.