Apparently I failed kindergarten

I am incapable of correctly operating a daily pill-minder.  For two weeks in a row I have filled up the thing with pills on Saturday, S-M-T-W-T-F-S, and then taken the pills out of the first S for my Saturday doses, and continued onward through the week, not noticing until the end of the week that I'm a day ahead every day.  Last week I was just confused about it and didn't figure out what I had done; when I noticed it again just now, I had to sit and look at it for a bit before I  realized finally that I should take the pills out of the second S on Saturday, because that is actually where Saturday falls in the frelling week.  Realistically, though, I should just fill it on Sundays instead and avoid the whole problem.  Or maybe there's a pill that can help with this sort of thing.