After playing through episode 5, and reading some comments in other threads, it seems like Telltale kind of screwed up the whole pregnant reveal. Lee was talking to Omid and Christa on the roof and Christa was about to say something, but then ahe cut herself off. But Lee just kind of says "You're walking for two" or something anyways. I certainly saw the hints before that point, but Lee never even let on that he knew anything before that moment. I noticed I had a dialogue option at one point that might've gotten her to say more, but I didn't pick it. Did anybody have that moment play out a bit better?
EDIT: P.S. Did anybody click the "You two go first" option when you're about to walk on the sign? All the playthroughs I've seen didn't pick it and I didn't either.