For women with regular menstruation, occasionally when menstruation advances 5 days, this ovulation will advance 5 days accordingly. For women with irregular menstruation, there is no clear pattern between ovulation and menstruation, and it is not possible to calculate the ovulation period through menstruation.
For women with regular menstruation, ovulation occurs 14 days before menstruation, and when menstruation advances, ovulation will advance accordingly, so when menstruation advances by 5 days, ovulation will also advance by 5 days.
For women with irregular menstruation, the lack of regularity in estrogen and progesterone secretion leads to ovulation and menstruation without a corresponding rhythm, so ovulation cannot be determined by menstruation, and follicular monitoring is recommended if pregnancy preparation is needed.
If there is a persistent irregularity of menstruation, it is recommended to consult a doctor in time for appropriate treatment and to calculate the time of ovulation under the doctor’s guidance.