What are the signs before a woman becomes pregnant? Pregnancy is something every woman looks forward to, but before getting pregnant, you need to know some basic information on how to increase the probability of pregnancy and ensure the healthy development of the fetus. Irregular Menstrual Periods One of the common signs of pregnancy in women is irregular menstrual periods. Under normal circumstances, a woman\’s menstrual cycle lasts 28 days, and it is normal for the cycle to fluctuate between 21 and 35 days. If you find that your menstrual cycle is shorter or longer than usual, and your cycles are irregular, you need to go to the hospital for a detailed examination to determine the cause. Breast changes before pregnancy 16-1