Under normal circumstances, the nipple is relatively soft, after pregnancy, the nipple will appear relatively sensitive state, mainly because after pregnancy, the body’s estrogen and progesterone, there is a large increase in the situation, so that the nipple has become relatively sensitive, touch the nipple with the hand, the phenomenon of erection will occur, the feeling of a relative hardness, which is the manifestation of pregnancy. If the phenomenon of nipple erection does not occur before menstruation, if the time to come to menstruation has not come to menstruation, we must be vigilant about whether it is because of pregnancy caused by menopause, it is best to stop menstruation for five days, the use of morning urine to do the early pregnancy test, if it is a positive rate of pregnancy will be very high.