It is not necessary to have menstruation 14 days after ovulation, if you have had intercourse during ovulation and did not use contraception, it is possible to get pregnant without menstruation. If the menstrual cycle is usually very regular, every month is 28-30 days once, the probability of menstruation 14 days after ovulation is relatively high. However, the menstrual cycle is affected by many factors, such as environmental changes, mental stress, work fatigue, prolonged late-night, mood anxiety and other factors, are prone to cause menstrual delay phenomenon, occasional delayed menstruation or do not come, is a normal physiological phenomenon. If you have intercourse in the middle of menstruation without contraception and are worried about pregnancy, it is best to go to the obstetrics and gynecology department of the hospital about 1 week after the delay of menstruation, and cooperate with the doctor to do a urine pregnancy test. If the test is positive, it is possible that you may be pregnant, and you will need to have an ultrasound examination of the uterus about 10 days after your period has been delayed to confirm whether there is a pregnancy sac in the uterine cavity.