Hi SG,
Hernias are not a big deal if they're not getting bigger. If they are getting bigger, it can be a very big deal. Bigger means either the opening in your abdominal wall (that your intestines are popping through) is getting bigger, or more intestine is pushing through the same opening than before. Neither is great news. If the full diameter of your intestine manages to pop through your abdominal wall, the bowel may become trapped and pinched (they call that incarcerated). And then the bowel can be strangled by the abdominal wall, cutting off the blood flow in that section of bowel. At that point, the bowel can die and you're in seriously deep trouble. I won't tell you how that can end; you can use your imagination.
"Baby on the way" size sounds serious. How big was it when your doctor last saw you? If significantly bigger, call your surgeon (or the surgeon on call) and let them know what's going on. I assume you're wearing a hernia belt 24/7, but if not, do so immediately. Seriously, don't mess around with this stuff; call them. Better safe than sorry.
;O)