In Avengers: Endgame, Tony has a conversation with his father. In it, his father mentions his wife is pregnant and Tony inquires about 'how far along is she?'
Something about Tony's reactions in this conversation suggested to me that something was amiss. As I remember it, they knew the date they were returning to, and presumably, he knows his own birth date, and the way the dialogue panned out suggested to me at least that these two things were incongruent.
So is there something to this, or did I misread the scene?