One week of pregnancy should refer to the situation when menstruation is delayed for more than one week. The common reactions are as follows: First, nausea, dryness and vomiting, which are most obvious when eating or brushing teeth. Secondly, the inability to eat or anorexia, a great reduction in food consumption. Third, the eating habits have changed significantly, such as the previous love of salty food may not like to eat now. Fourth, sleep habits may change, for example, you may not be able to sleep or wake up easily at night, or even dream easily. Fifth, the mental state may change, such as mental excitement, nervousness or irritability, and the mind becomes unstable and may be good or bad at times. Sixth, the hormone level and its content in the body may change significantly, for example, estrogen, progesterone and lactogen should be elevated, the thyroid gland function is enhanced, so the level of thyroid hormone is elevated, and the dopamine content in the body is also elevated.