In my very first fasting attempts I ended up looking a bit pale. It wasn't from the fasts themselves but from the poor eating that often followed them. So I was ending up a bit anemic no doubt from endless abortive attempts. I've never had a pale face on any fast since or post fast where I've fasted for longer than a couple of days and broken the fast correctly.
Don't be too hard on yourself before Saturday, if there's a major craving there for something junky don't be afraid to give in to it. It may stop that particular craving making you break the fast in a few days!