"I've been on the pill for so long; how hard will it be to get pregnant?" she told Glamour about the concerns she had two years ago. "Suddenly I realized I really didn't know what's going on inside my own body."
The former "7th Heaven" star, 33, also admitted that she was clueless when she got her period in the fifth grade. "I thought 'What is happening to me?'" Biel said.
Biel brought her concerns to Pelletier, founder of WomanCare Global, an organization that focuses on women's reproductive health. Pelletier has already been working to get contraceptives and feminine products to developing countries through her campaigns like Project Dignity.
But Biel's conversation with Pelletier sparked concerns about women's reproductive awareness in this country.
"More than half of our nation's pregnancies are unplanned," Pelletier told Glamour. "Jessica and I realized we can help change this."
The videos will cover topics like puberty and contraception and are set to launch on Sept. 28, according to the WCG website.
"We want girls to know what their [body is going through] so they don't feel scared or ashamed or gross," Biel said. "We share girl stories, fears, and insecurities. The tone is informative but also goofy, smart, witty."