Excessive worry about pregnancy will lead to delayed menstruation, because women’s menstruation, in addition to the role of the ovarian secretion of estrogen and progesterone, but also by the hypothalamus and pituitary gland secretion of hormone regulation. If a woman is overly worried about being pregnant, the brain will be overly nervous, the hypothalamus will regulate the secretion of hormones from the ovaries will be weakened or disappeared, which will lead to the delay of menstruation, so women should not be too overly nervous, especially before and after the onset of menstruation. If you are worried about being pregnant, you can take the first urine test in the morning about 10 days after sex to know whether you are pregnant or not.