Ovulation occurs 14 days before the first day of menstruation. Five days before and four days after the day of ovulation belong to the ovulation period, the entire ovulation period in about 10 days, in the ovulation period when intercourse is easy to conceive. Some women have irregular menstruation, often advance or push back can not be calculated to determine the exact period of ovulation, there will be errors, you can determine the period of ovulation from the body’s changes, such as bleeding during ovulation. After the follicle rupture and ovulation, the level of estrogen in the body will drop dramatically, not able to maintain the normal growth of the uterine lining, there will be a localized shedding, resulting in a small amount of bleeding phenomenon, not every woman will have ovulation bleeding. In the ovulation period when the basal body temperature will rise, than the normal body temperature will rise 0.3-0.5 ℃, ovulation will also change the leukorrhea, appearing transparent filament, when the body appears these changes indicate that in the ovulation period.