Also, visit a healthcare professional about your period if: 1  You havenât gotten your first period by age 15. 2  You donât menstruate for more than 90 days. 3  Your periods start to be very irregular after having previously been regular. 4  Your period lasts for more than seven days. 5  Your menstrual flow is more heavy than usual.
This stage continues until your baby passes through the birth canal, vagina, and is born. This stage may last two hours or longer. Contractions may feel different from the first stage of labor -- they will slow to 2 to 5 minutes apart and last from about 60 to 90 seconds. You will feel a strong urge to push with your contractions.
The birth process can be divided into three stages. 1  The muscles of the wall of the uterus begin to contract. These contractions occur about every 15 minutes and last from 15 to 30 seconds. 2  During this second stage, the calf enters the vagina causing stronger contractions from the diaphragm, abdominal muscles and uterus.