Is it normal for menstruation to occur 20 days after ovulation?

20 days after ovulation to menstruation, under normal circumstances is abnormal, details are as follows:

women's menstrual cycle is determined by ovulation. Under normal circumstances, in about two weeks after ovulation, menstruation will come. If 20 days after ovulation to menstruation, may be due to corpus luteum atrophy incomplete. In this case, corpus luteum does not shrink in time, resulting in endometrial can not normally shed, resulting in menstrual delay, so consider is abnormal.

If menstruation delayed for a long time, and menstrual delay more than 7 days, it is recommended to seek medical treatment in time.