Safe, but might be unappetizing.
Can happen on occasion.
Some bird can always have blood or meat spots, not necessarily a health issue.
Blood spots are from a blood vessel breaking when ova is released from follicle.
Meat spots are from a tiny piece of tissue breaking loose from the reproductive tract.
If it keeps happening or gets worse, yes. But otherwise no. It happens from time to time. That’s why a lot of us crack eggs into separate containers before we put it in the pan.