Meh I wore a bikini when I was pregnant, and was more comfortable found so than before I was pregnant!
Now however I'm more than happy to wear one cos I love my post baby body

Wear what you are comfortable in. I'm certain you aren't a s**** with no sense of decency and that you dress appropriately, but fashion changes and showing off your bump and being proud of it is nothing to be ashamed of. I'm sure in 30 years time we'll be the ones saying I can't believe you are wearing that!