Well, we've all forgotten to do that, so don't feel like you're the only one. Sugar solution tends to sink to the bottom. So there's a pretty good chance you'll have some of the earlier bottles be overcarbonated. There may not be enough sugar to create bottle bombs, although I would certainly take precautions as others have recommended, but you will definitely have gushers when you open some of the overcarbonated bottles up. I recommend putting a bottle in a bowl, crack the cap just a bit and let it depressurize slowly. It will foam out, but not as bad as yanking that cap off all at once, and the bowl will catch the mess. Also, keep the bottles really cold post conditioning.