Can I still drive the car?

I used a screwdriver to unscrew the drain plug and the head popped right off. The coolant isn't leaking right now, but I was concerned that it might if I drive around...namely to the insurance adjuster appointment I just made and to the parts store to get a new plug.

I can't remember if the plug has a rubber seal at the end of the threads...can anyone calm my anxiety??

Thanks,
-Geoff

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now