At any rate, near the end of my workout, I approached the free weights area and happened upon a pregnant woman doing dumbbell curls. Given her dimensions and proportions, there was NO question that she was pregnant - take my word for it on this one.
As I passed her, she had just finished the set she was doing and let the weights and her arms hang down on each side. I looked at the weights in her hands and then said, gesturing to her belly, "I think you're lifting those dumbbells wrong."
She paused for a moment, got a funny look on her face, and then she laughed - fortunately.