If you're not sure, err on the side of caution: change the oil.
As suggested earlier, leave the filter.
Some time ago, I would not have suggested saving the filter, but last year a shop put an unacceptable oil into the engine, and after a couple of hundred miles I decided to change it. To save a few bucks and some time, I just drained the sump and refilled it. I now feel comfortable about continuing to use the filter, in part because the filters are rated for high mileage and I change oil at much lower mileage. That scenario seems similar to your current situation.