ANDY'S ANSWER: I'm sorry that your period has caught you by surprise, but it's a natural thing to happen when a girl starts maturing. It's not too hard to be prepared. Buy a box of pantiliners and another box of heavier pads. As soon as you see some sign of a period, (red or brown marks on your underwear) you can start wearing a pantiliner to protect them. As your periods get heavier, you might need to switch to a heavier pad.