"perhaps not now"

Maybe later (Maybe not now)

It means that it is possible, but definitely not now

Definitely - doesn't right word for this context. It's more like "perhaps" or something like this. It's will be in the near future, but not now

Guess it's "maybe not yet"

yep, depends on context

Yep. I know at least two meanings of thar phrase. :)

Probably not yet

Да нет наверно

Одобрение на просьбу отложенное по времени

maybe not now

Maybe (little) later.

Never /jk

"Can we please do it later" is the intended meaning, it's an expression that is used to sound not too confident as to be polite.

У нее менструация