I think you're OK. The waterpump is mounted to the front cover, not the block. Some of the bolts go through the coolant passageways. That explains the water on the bolts. You're supposed to coat those bolts in something before you put them back in. I think its teflon tape or silicone. Maybe some other goo. If you're stilll concerned, just change the oil. I mixed oil and coolant once under load when my gasket broke and nothing bad happened. I probably got lucky though.
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