Could cooling system fluid be leaking into oil through waterpump?

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A few weeks ago, my truck broke down. I thought it had jumped time, but it was the timing belt and waterpump that needed replaced. At the same time, I had a new thermostat put in and a oil change/filter done. I noticed that my heat wasn't working, so I took it in and had the radiator and cooling system flushed. It ended up being flushed 3 times. The heat was only barely working, so I told them to try another thermostat. Well the one that was put in first, was put in crooked without gasket sealer. So it warped the thermostat and the housing. A new thermostat was put in, it took 2 gaskets to get it to seal good. A few days later, my check engine light came while I was driving 35-40 mph. I only had a mile left to my destination. The first thing I did was pop the hood and start checking fluids. Well, when I got to the oil, the stick was creamy white. Of couse the first thing that came to my mind, was that I blew my headgasket. Is it possible that fluids could be leaking from any other place, like the waterpump area or such. I was wondering this since the first person that put in the thermostat crooked also put in the waterpump.