I am almost appalled at myself. This morning on the Metro, with all of the seats full, I opened my jacket and conspicuously put my hand on my belly in hopes of being offered a seat. It worked, though -- within a few minutes, the girls standing in front of me said "she's pregnant," and the woman in the seat next to me offered me her seat. We ended up chatting about her 2 1/2 year old twins, her pregnancy, day care, nannies, etc., etc. during the remaining stops. I got some helpful advice. I still feel a little guilty about it, though.