When you're on the pill your motivation to make your partner use condoms may be reduced. That may increase your risk of sexually transmitted diseases. You have to remember to take one every day. Your breasts might get larger. The pills can cause headaches, depression or high blood pressure, but this is not common.
Some women have a harder time controlling their weight while on the pill.
Certain medications decrease the effectiveness of the pill. Other medications, including many antibiotics, may also reduce the effectiveness. There are many misconceptions about the pill. You can gain weight on the pill if you eat more or exercise less. The pill does not decrease your chances to have children in the future.