It sounds like you had water in the crank case.
Stop running it immediately and drain all the oil. Then make sure the crank case is empty of oil and clean, and refill with fresh oil. After you fill it back up with oil, run it a minute and check again for any milky/foamy oil. If it is clean, check it again after several minutes. If it stays clean, you should be good. If it is milky again, take it for professional service, as you probably have a damaged gasket somewhere.
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