Some girls use only one method and others switch between different methods. If the egg is not fertilized, the uterus lining breaks down and bleeds, causing a period. PMS premenstrual syndrome is when a girl has emotional and physical symptoms that happen before or during her period. If you have questions about periods, ask your doctor, a parent, health teacher, school nurse, or older sister. The same hormones that cause the uterus lining to build up also cause an egg to leave one of the ovaries. This is normal at first.
If cramps bother you, you can try:.
Can a Girl Get Pregnant if She Has Sex During Her Period?
A period happens because of changes in hormones in the body. If there is no fertilized egg, the lining breaks down and bleeds. Gyn Checkups Your Changing Body: Yes, a girl can get pregnant as soon as her period starts. The ovaries release the female hormones estrogen and progesterone.