im going to bullet point this coz its easier.
1) even on her first time she can get pregnant.
2) Pre-ejaculate can get a girl pregnant. you dont know you have released it.
3) unprotected sex leads to babies.
4) if her period is late she can do a test and it should be accurate. if it is negative, test again in a week or two.
5) if you arent ready for a baby, USE PROTECTION!!! EVERY time, or dont have sex!! its not rocket science!!

RIGHT ON THE MONEY EVERY TEEN SHOULD READ THIS BEFORE POSTING.