A childhood belief about getting pregnant

When I was about 9 or 10 (30 years ago), I happened to see an article in the paper about a 10 year old girl that had given birth to a baby girl. I took the paper to my mother and asked her how did this girl have a baby. My mom, being very religious, told me that the girl had done something bad. A couple of weeks later, I had told my mother a lie. I starting thinking about what my mother said about the girl who had the baby. I was so afraid that, since I had done something bad, that I was going to get pregnant - and my mother would find out that I lied. I tried very hard not to do anything bad after that experience.