Gestation period is 4-6 weeks, so the birth is certainly going to be fairly soon which ever way you look at it. Without a photo, there is no way of saying how soon it might be.
The thing with livebearers is that they will have another batch of fry after another 4-6 weeks. If there is another male in the tank, she will be constantly gravid. She has the ability to store sperm packets for 6 months or so after her last encounter with a male, so even if you have no males, she would still continue producing fry for some months.
And, of course, this applies to ALL females.
What this adds up to is bucket-loads of fry that aren't particularly easy to rehome, if you try to save them all. You will find that the fish in your tank will predate upon the fry and only the strongest, fastest fry will survive - which is rather what nature intended - and you won't become overrun. Therefore, don't look after the fish. They don't need you to look after them (in that way), they've been reproducing successfully this way for millions of years.
