When to move pregnant guppy to breeding/birthing tank!?

[scotianocean]

Hey all, I lost track of how long my guppy has been pregnant for and I’m wondering when I should move her into the breeding/birthing tank? I don’t want to stress her out but I feel like it will be any day now... I have attached some photos...

Thanks in advance!

 

[Autumnsky]

Any babies yet?

When the momma looks very square and like she will literally pop. And often you can see little eyes.