Whether what your seeing is normal or not depends on how long it's been since the pan was last dropped and cleaned. If you got about a 1/2 teaspoon of filings and its been a couple of years since the last inspection I'd say make no changes and run her. Always change the oil filter "regardless" and if the oil look and smells good (not dark coloured or burnt smelling) I'd put her back in and run her. If you've seen these conditions and have only run a couple weeks then you could have a bigger problem.