Being pregnant in 6th grade just boggles my mind. I didn't even begin certain natural biological processes until I was 12. I wasn't think at all about sex at that point.
The earliest I remember classmates getting pregnant was in high school. My sophomore year. One girl was sent to the "alternative" school next door. I couldn't figure out what had happened until 9 months later, she shows up at a football game one night, significantly larger than when she had left and holding a baby. It finally clicked.
I lived a sheltered life.