You are growing hair down there your nipples forming into balloons and every month for about a week blood comes out of what is happening to me?

It sounds like you are going through puberty. Puberty is a time of rapid physical development that typically occurs between the ages of 10 and 14 in girls. During puberty, the body produces more hormones, which cause a number of changes, including:

* Breast development: The breasts begin to grow and develop into their adult shape. The nipples may also become larger and darker.

* Pubic hair growth: Hair begins to grow in the pubic area and under the arms.

* Menstrual periods: Menstrual periods, or periods, begin when the uterus sheds its lining and the blood and tissue exit the body through the vagina. Periods typically occur every 28 days, but they can be shorter or longer.

These are all normal changes that happen during puberty. If you have any questions or concerns about puberty, be sure to talk to your parents or doctor.