White smoke is normally a warning sign for burning coolant, and these head gaskets generally fail internally rather than externally so that's worth checking for exhaust gases in your coolant or otherwise following up on.

If not that, it is definitely possible you've got a coolant leak at a hose or the WP. The common spot on the waterpump is actually right at the top center, underneath the pulley and it's nearly impossible to see it without pulling the fan/pulley off to get access. It also has the advantage of dripping directly on the belt so it sprays coolant everywhere and makes pinpointing the issue difficult.

The best thing for you to do is going to be pulling the fan/serpentine belt out. Not a difficult job at all, maybe 10m if you know what you're doing.