first off I would make sure that it isn't condesation. It is that time of the year and there are many times I have seen one side a lot worse than the other. If your coolant isn't way low I would do some more checking before jumping to conclusions. Your coolant level may even look low after standing for a period of time when in reality it is not or just meeds topping off.
Don't start taking anything apart til you do some in depth checking. Head gaskets are not really that proe to leaking.