Protruding nipples are not necessarily pregnancy. It is a normal physiological reflex that the nipple hardens and protrudes when it is exposed to certain external stimuli. In addition, nipples before or during menstruation may show similar symptoms. If the nipple is abnormally protruding or accompanied by abnormal discharge, it is important to be alert to various breast diseases such as mastitis, breast cancer, etc. and to consult a doctor in a timely manner. After pregnancy, the nipple will become more sensitive, there may also be a feeling of soreness, nipple, areola color deepening, this is because of the hormone level changes in the body after pregnancy, the body for the postpartum breastfeeding began to prepare. Therefore it is inaccurate to judge whether you are pregnant by the changes in your nipples. It is best to take a blood test for blood HCG or urine HCG with early pregnancy test paper, as well as a gynecological ultrasound to check whether there is a pregnancy sac in the uterine cavity after 3-7 days of menstruation, in order to diagnose whether you are pregnant or not, which is more accurate and reliable.