I can't relate exactly to your situation, but one of my "friends" (I use the term loosely here) was a few months pregnant when I lost Ianto. I didn't know this, so I said it was okay for her to come over when she wanted to bring me some flowers. She showed up with a massive preggy belly and it seemed like she pretty much flaunted it everywhere At one point, she even grabbed my hand and said, "have a feel, the baby's kicking!" - yeah, thanks, just what I need now, moron! I think that contributed to my not being able to be near pregnant women for a few months

She's due in the next few weeks, and I'm dreading the birth announcement. She didn't even want her first one, or this one (not that that means she'll love them any less, I just mean it's not fair on me to watch her) and doesn't seem to appreciate what she's got.

You're not being overly sensitive at all! It's completely natural to have those "what about me?" moments, whether it's because you want people to consider your feelings before they speak/act, or because of jealousy.