Yes, it is ok. It’s rare to see as less than 1% of eggs will contain a blood spot. Normally during grading these eggs will be separated, however sometimes an egg will slip through as it’s harder to see blood spots in brown eggs.
Blood spots are caused by the rupture of a blood vessel during the formation of the egg. These tiny spots do not indicate a fertilized egg. If desired, the spot can be removed with the tip of a clean knife prior to cooking.