A woman may ovulate twice a month. The vast majority of women ovulate only once a month, but there are a few women who ovulate twice a month, and there are individual variations. For women with regular menstrual cycles, ovulation usually occurs about 14 days before the next menstrual period and only one mature dominant follicle is discharged in a month. However, some women have shorter menstrual cycles and may have two menstrual periods in a month, which may result in two ovulations. Furthermore, there are many factors that can affect ovulation, such as taking ovulation-promoting drugs or changing hormone levels due to bad lifestyle habits, all of which can lead to ovulation twice a month. If a woman is planning to conceive, it is advisable to go to the hospital for ultrasound to monitor follicular development before arranging sex.