No need to rush to discard it. You are just setting these eggs in the incubator (I didn’t think you meant brooder). By 4 or 5 days you will be able to shine a light through the tops and see some veining. Don’t race to discard until it’s such a clear difference. Since I hatch staggered and concurrently, I’ll mark all Eggs one way that I set one day . I’ll use a different color to mark a different day & note them in a notebook. I have noticed over time that my silkie Eggs may look like they haven’t veined, and others have at day 3. Usually by day 5/6, I’ll see their veining. They often appear to me behind initially when alongside another (especially LF ) breed. By day 15, there is so much darkness filling the egg with chick. This is when I start chucking the clears. Unless you see leaking or smell, a fresh egg that’s set, should be fine, even if infertile.
Also, because a bloodspot is often a young pullet egg, I wouldn’t sweat it. If it develops, even if it stops, it wouldn’t be worth throwing out.
You’ve got this!