The normal time of menstruation after ovulation is the 14th day after ovulation, and there is no difference between the two days before and after, this time is relatively fixed. For some people with irregular menstruation, you can follow the time of menstruation and push it forward 14 days, which is the day of ovulation. If you usually have a very regular period, once every 28 days, ovulation will occur on the 14th day of your period. If you have not had your period for more than 16 days, you may be pregnant. If you have had your period for less than 12 days, it means that your corpus luteum is not functioning well, possibly due to premature atrophy of the corpus luteum, or due to abnormal follicle development, so you need to identify the cause and then carry out menstrual regulation and ovulation treatment.