What message does she want to send to other teens about premarital sex? "I definitely don't think it's something you should do; it's better to wait," she told the magazine. "But I can't be judgmental because it's a position I put myself in."
After she found out from a doctor that she was pregnant, she said, "I took two weeks to myself where I didn't tell anybody."
"Only one of my friends knew because I needed to work out what I would do for myself before I let anyone's opinion affect my decision. Then I told my parents and my friends. I was scared, but I had to do what was right for me," she said.
Spears broke the news to her mother, Lynne, just before Thanksgiving, the magazine reported.
"She was very upset because it wasn't what she expected at all," Spears said. "A week after, she had time to cope with it and became very supportive."
Lynne Spears, already grandmother to Britney's young sons, told the magazine: "I didn't believe it because Jamie Lynn's always been so conscientious. She's never late for her curfew. I was in shock. I mean, this is my 16-year-old baby."