J.P.
I waited till 20 weeks too. I had low rise jeans that seemed to still fit somehow, and big baggy t-shirts. It was also winter, so I could keep a scarf on and just say that the office was chilly. Yes, we have a relaxed dress code. I also started out with the maternity tops, but just the big stretchy shirts, not the "Hey everyone, I'm pregnant" tops. I find that empire waists make non-pregnant people look pregnant, and since they are in fashion, no one may notice.