I had my daughter when I was a senior in high school at 17
Wow! Teen pregnancy is pregnancy in females below the age of 20, so 17 is very young!
How many teenagers get pregnant every year?
A lot.. about 13 million children are born to women under 20 around the world.
That's more than I expected.  What kinds of things are done to try to prevent more teen pregnancies?
Sexual education can help with the issue of teen pregnancy by educating young women on issues relating to human anatomy, abstinence, and birth control.
How much has the teen pregnancy rate increased over the years?
Well, industrialized countries have distinctly different rates of teen pregnancies than a developing country may have.