From the Star-k dot org
The Mechaber states explicitly that roasted eggs may be eaten even though it is impossible to check them for blood spots, and the Ram”a explains that the rationale for this is based upon the right to rely on the majority of eggs that have no blood spots. The Ram”a notes, however, that the minhag is to check eggs during the daytime when it is possible – but clearly allows the use of unchecked eggs at night since the option of checking them is not available. Concern over blood spotted eggs today is further mitigated by the fact that the vast majority of eggs sold for food are derived from hens that have never been near a male in their lives. Hens are segregated in huge coops at times containing up to a million birds at a time – for the sole purpose of converting chicken feed into eggs. Such eggs are referred to in the Gemara as Safna Me’ar’ah, and the blood found in such eggs would never prohibit the entire egg. The Iggros Moshe, Yoreh De’ah: 36 discusses the status of blood spotted eggs in countries where such eggs predominate and notes that the Minhag is still to discard the entire egg. However, in cases where a blood spotted egg was cooked in a pot with another egg, there is no basis to be concerned with the status of the other egg or the pot (unless one is aware that it is definitely from a fertilized egg).