Menstruation started on the 27th, what date is the ovulation period?

Generally, if menstruation begins on the 27th and the menstrual cycle is regular, the ovulation period is approximately between the 9th and 17th of the following month. The detailed analysis is as follows:

In women with regular menstrual cycles, the ovulation day typically occurs about 14 days before the next menstrual period. The ovulation period spans approximately 4-5 days before and after the ovulation day, during which the probability of conception is higher. If menstruation starts on the 27th and calculated based on a typical 28-day cycle, the next menstruation would likely occur around the 24th of the following month. Counting backward 14 days, the ovulation day would be approximately on the 10th of the following month. If the cycle is 30 days, the next menstruation would be around the 26th of the following month, making the ovulation day approximately on the 12th of the following month. Considering various common regular cycles, the ovulation day generally falls between the 10th and 12th of the following month. Therefore, the corresponding ovulation period would roughly cover from the 9th to the 17th of the following month, including the ovulation day itself as well as the survival time of both egg and sperm, aligning with the timeframe of higher probability for conception.

After estimating the ovulation period, couples planning pregnancy can reasonably schedule intercourse during this period and maintain regular daily routines. Those without pregnancy plans should take contraceptive measures to prevent unintended pregnancy. If significant abdominal pain, increased bleeding, or other abnormalities occur during the ovulation period, timely medical attention is necessary. For individuals with underlying conditions such as hyperthyroidism or hypothyroidism that may affect menstrual cycles, regular monitoring of the disease condition is essential to ensure accurate judgment of ovulation regularity.