But getting it any time between age 10 and 15 is OK. You have many choices about how to deal with period blood. How Can I Be Sure? The built-up lining is ready for a fertilized egg to attach to and start developing. By about 2—3 years after her first period, a girl's periods should be coming around once every 4—5 weeks. A period happens because of changes in hormones in the body.
The egg travels through a thin tube called a fallopian tube to the uterus.
All About Periods
Hormones are chemical messengers. These symptoms can include moodiness, sadness, anxiety, bloating, and acne. But some girls get their periods a little less or more often. If cramps bother you, you can try:. It is a sign that she is getting close to the end of puberty.