Menstruation comes normally a few days commonly

Menstruation is usually 21 to 35 days. A cycle is calculated from the first day after menstruation to the next menstrual cycle. Menstruation usually lasts three to seven days. If it is less than three days or more than seven days, it is abnormal and needs further examination. The 14th day after menstruation is the ovulation day, and the three days before and four days after ovulation belong to ovulation. This time period is the most suitable time for conception. Women can arrange the same room reasonably during this period, but pay attention not to be too frequent to prevent the quality of male sperm from declining. Menstruation may be delayed or advanced, generally within seven days, are normal.