Candling question

[Mrsfoote]

So I have had eggs in the incubator for 3 days now so I candled today and my question is do the yolks float I know this maybe a really dumb question but I'm trying to candle BLRW eggs and they are hard to see through but on a few I saw veins already.

 

[Nelaka]

Seeing veins is a good sign.
Post some pics so we can see.
I am no expert so what I'm saying could possibly be wrong.