I don't know where my period is and it is like clockwork?

I am very lucky to have a regular 28 day cycle (it's like clockwork). My period is nowhere to be found and I have had no signs of it either, it was due Dec 30 2008. All I have is white discharge no matter how much I shower or change underwear. I have always been a deep sleeper, and it doesn't take much for me to fall asleep but the past 2 nights I have woken up multiple times to pee and just could not go back to sleep. I would drift off and when I'd wake up again, the clock tells me I had only been snoozing for 30 min or an hour. Not to mention I cannot get comfortable no matter what position I try to lay in. I drank some milk hoping it would help, but nothing. I need some advice please!