Did anyone NOT find out they were having twins until LATE pregnancy or delivery?

[1blessedmama]

I'm just curious...for anyone who did NOT find out early on (like, prior to 20 weeks) that they were having multiples (either no u/s by choice or 1st u/s really late in the game), did you have any indications throughout your pregnancy that it may be twins? Size? Amount of movement? Intuition? Palpation? etc... If you weren't going to have an u/s during the pregnancy, what prompted you to do it? (which would have been when you found out) And if you didn't know until delivery, how the heck did that happen? LOL