How do they know?

I think my breasts are the smartest part of my body, aside from my brain. No other solitary organ knows what cycle day it is but them. Well, to be fair, maybe the others know what day it is. But they certainly haven't got a clue what they're supposed to do on certain cycle days. But when it comes to "the girls" I don't even have to check my calendar. I know when CD20 has arrived because they start throwing absolute fits. The doc said it was a side effect of the Clomid to have particularly whiny girls. I'm not on the Clomid this time. So maybe it's just in the nature of the beasts. Really, who would have thought that sacks of fat could create this much ruckus? In any case, they sure are punctual. To be optimistic, I suppose this bodes well for the time management skills of my future children.