This being a comedy, I think there will be a scene at the very end where Ted come out of the room where he was telling the story, and the mother is there waiting for him.
She'll say, "Well? How did it go?"
Ted responds, "Ok, I think."
"So, you told them ... ?"
"Uh ... CRAP!"
"So they don't know that I'm pregnant???"
"I guess I'll have to try again."