No one really knows, it is one of the wonders of this world, but get used to it because it will happen every 28 days around the same time. Now on the chance it doesn't then you might have a problem that means you could very well have herpies, just be sure to check on your self regularly by brushing your teeth with a bamboo brush that has been wrapped in a burlap sack for at least 4 days in direct sunlight or eat a raw goose egg while in a red shoe and a black shoe, with the slice of bacon in your left ear. These are the only ways i know to take care of this. Good luck
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