Overweight pregnancy?

I'm just wondering if anyone has gone through pregnancies and been overweight before it happened? I was trying to lose weight when I got pregnant. I am excited for this, but also a little bummed. I see all these tiny gals on here with cute little baby bumps and I'm not going to be one of those gals. I hate to sound ungrateful or shallow, but this has really been bumming me out in the last few days. I'm also worried about being physically healthy enough to go through pregnancy and delivery. And worried about baby's health too! Basically worried all around. Any words of wisdom?