I don't see anything wrong with displaying your letters proudly when pregnant! Pregnancy is a special time in a woman's life, so there isn't wrong with using your lettered shirts to cover your belly!

You're using the shirts to *COVER* your belly, and nothing's wrong with that. If you decided to use a really really tight baby tee that didn't cover anything, then...well, that's a different story.

Good luck with your bun in the oven!