"If you dont give her the birth control then they " worry of getting pregnant and of course thats a sure sign that they had sex and they get caught"
This is a HUGE misconception. If this was true, then so many teens wouldn't get pregnant! Teens indulge in risk-taking behavoir because they think "it won't happen to me". Do you honestly think teens will say "that's a No Zone we better stop." Get real- these aren't little children! Teens think they won't get caught, they think are smarter than everyone else. The "bird and the bees" are a thing of the past- kids today know a lot. Talking frankly with your kids about human biology and exaclty how a baby is made- and talking about misconceptions like "you can't get pregnant while on your period" and so on is the best way to approach it. I would rather empower my teen to control his/her body, than end up raising a grandchild.