Wow. That's pretty awesome! Maybe you are just super in tune with the moon or something. >_>
I am kind of the opposite. I only vaguely know when mine will come. I mean.. it comes monthly, but I never keep track so I never really know! a surprise every time! (I catch it in time before anything bad happens, but yeah, I am pretty... blase about it).
Sister on the other hand.. she has a whack schedule. Comes one month, then diappears for 6 months, then comes back. Always been like that and going on a pill for a while worked, but afer going off of it, her schedule went nuts again. Wish I were her though.. once every 6 months would be awesome. xD