female guppies

Ok so I’ve recently purchased a smaller tank for birthing, and I was wondering if it was a smart idea to place my obviously pregnant guppy in there ? And also does she look close to giving birth? I can see the fry eyes

I currently have female and male guppies in my fish tank, they've all been together in the same tank for about 4 days. When exactly do they start breeding? Do most start at a week after first being put together or days after? If days after, how can you tell if your female(s) are pregnant? I read...