Total Brain Fart!

I was being so exact this month with when I should take provera, clomid, etc. My only concern was that CD21 fell on a Saturday and so which day should I go in to do my b/w. Well it turns out that CD21 is actually Friday! Which I didn't realize till tonight. It's too late too call and reschedule my b/w and so now I have to wait till Monday, which will be CD24. I'm not sure why I kept thinking that CD21 was on Saturday. Arg!