No, it does not hurt. On a 0-10 pain scale, I would have to say that it's a 1 at its worst. Before I was diagnosed, I would mention to my husband that my abs felt odd and that I wanted to take it easy. But that has been the extent of it.
If it doesn't hurt, then what does it feel like?
Other than feeling "odd" at times, I occasionally feel a stretching sensation in my abdominal region. This sensation is similar to the stretching I felt during my first pregnancy, though it is more localized to my upper abdominal region.
Does it look funny?
At this point, you can't really tell that I have diastasis recti by looking at me. The only time someone can see anything unusual is when I move in a way that increases my intraabdominal pressure, such as coughing, laughing or performing a sit-up (which is not recommended -- it's just how my OB assessed me). I will say that I can feel a gap between the two side of my rectus abdominus muscle, especially at the upper aspect.
I have seen photos online of more severe cases and though they can be a bit scary-looking (especially photos of the severe herniations), cases like those are rare. If you receive proper care and support, that isn't likely to occur. Of course, I have 14 more weeks of pregnancy to go, so I'm trying to stay calm during all this. Doing my exercises and wearing my splint help boost my confidence.
I also will add that though I am measuring large for my gestation, the baby measured normal on ultrasound.