Like you I'm also getting the odd nick, and keep shaving over them. I think the problem may be that when I go over and old nick I go slow or even stop, which as jfk said is more than likely going to cause a nick.
If you are keen to shave daily, it would make sense to give your face a rest for a couple of days to let everything settle down before picking up the straight again.
I think the eagerness we newbies have to shave everyday, actually creates more problems initially and we need to be more patient. Just a thought that may help.
Good luck and keep enjoying the experience.