This evening, at the maternity store (because once again I have nothing that fits).

Me, to the very kind saleslady: Do you think I should get this one size up?

Saleslady: Oh, no, I think it's fine and you don't have much longer, do you? You're nearly there. How far along are you?

Me: Um. Twenty-one weeks.

Saleslady (her jaw dropping to her chin and her eyes fixed on my belly): Oh, deeeeaaaar....

I bought the next size up;-)