2x3 - The Sleepover Club

When Brooke has her first sleepover she is embarrassed about what the girls will think of her parents so she keeps making excuses to avoid it, and ends up pretending that Lisa is pregnant. However the girls still want the sleepover and end up deciding that they should turn it into a baby shower for Lisa. When Brooke hears her parents talk about the baby, it turns out that Lisa really was pregnant.