I kept lifting all the way up until the day of the surgery, which was about 5-6 weeks after I discovered it. I did have to lighten up the weights, especially on squats. But I saw the surgeon a couple of weeks after I noticed it, and he said go ahead and lift as much as I want as long as its not causing any pain. I was completely off working out after the surgery for 4 weeks, then I started back real slow the first week, upped it a bit the second, and now its 7 weeks later and I'm good as new as far as the hernia is concerned.
Of course, everybody is different and my case was not too bad. So I would say see a doc ASAP, you wanna make sure its not in need of immediate surgery if you have a more serious case. If you do have part of your intestines or internal organs pushing out and being strangulated, putting it off could make it 100 times more serious than it presently is. Usually the bulge is really large in those cases, but let your doc make the decision.