What you need to know
Periods are a natural part of growing up. And your periods are a sign that your body is now able to have a baby. Each month one of your ovaries (you have 2) releases an egg. The egg travels down 1 of 2 tubes called fallopian tubes and into your womb.
The lining of your womb thickens for a short while during this time. If the egg is fertilised by sperm from a boy's body, it will stick in this soft lining and grow. This is how you get pregnant. If the egg is not fertilised, then the lining of the womb breaks down and passes out of your body through your vagina as a small amount of blood — this is called a period.
Try not to feel embarrassed — half the population has to go through this, so you shouldn't feel like it is a negative or dirty thing. It's part of the cycle of life!