It is recommended to calculate the days according to your last menstrual date. The menstrual cycle is about 28-30 days, and it is normal to come during this period. If you have not had your period for more than 30 days, you should first rule out pregnancy. If you are not pregnant and your period is delayed for more than 7 days in the future, consider irregular periods and pay attention to keeping warm and resting. Delayed menstruation is also related to the last menstruation, if you eat cold, cold and spicy food during the last menstruation can also cause delayed menstruation and so on. Generally do not worry, keep the pubic area clean and hygienic, wash the vulva every night, do not get cold and do not eat cold drinks. In addition, relax, keep your mood relaxed, do not eat cold, spicy, stimulating food. Also drink more brown sugar water to invigorate blood circulation, and at the same time you can take blood circulation drugs.