I have 3 pairs of canaries, i checked 4 eggs 2 are empty and 2 have yolk in them?

Question

so the ones with the yolk inside ...i keep those right?

Answer 1

All eggs will have yolk, what you're looking for is veins or a black dot in the yolk. They wont show up right away. I would let her sit on them anyways even if they aren't fertile. If you take them away she'll just lay more, which could cause egg binding and calcium deficiency.  

Answer 2

You should not have open them cuz thats a really new born baby probaly 3 weeks early do not touch it and i rekon it will die......(stupid)