Eggs when do you notice movement ?

[Tempestas]

Basically what it says in the title When is first movement usually witnessed ? The reason why I'm asking as most will know I had my first clutch laid on Tuesday 16th I candled them all last night to check for vein structure etc and they are perfect every single eggs got great vein structure BUT I noticed movement in the eggs already now I was a little shocked by this because from breeding other species I never noticed movement until a couple of weeks into incubation so I am a little thrown. I know theres probably an explanation for this so for I'd ask

Thanks guys.