Hang in there ladies...the last days were the hardest for me, too but keep reminding yourself that you can do it, the wait is almost over. One day at a time helped me get through it. I went to my edd with #1 (and 3 days over with #2...just hoping this one doesn't follow the same pattern!)
I'm in the same boat. 39 yr and 16 days to due date but wishing her out now! Heartburn, am snoring like a fiend and waking myself and hubby up several times per night. No stretch marks but itching all over the bump, knocking it on everything as not getting used to the protrusion, shattered all of the time and feeling like a fat, useless lump!!!
I think it is a little more common to go past. The only reason I had mine early was because it was a scheduled c-section. The last few weeks is rough. I think I actually slept more after my little girl was born. Good luck, you are almost there.