With any eggs, when you put them in the bator begins day 1. Most people go by if the eggs are set before noon, then that is day 1, and if in the afternoon, then the next day is day 1. Supposedly this makes it easier. I just go by the day set is day 1, I would rather think they were a bit late...
Have you candled them at all? Day 12 for rocking is awfully early. If the egg is bad, gases inside the egg could cause it to 'move'. I would check it with a light, and/or smell it to make sure it isn't rotten. Otherwise, no, I wouldn't increase the humidity this early. I have had quite a few...