Im not an expert but i just bought here from pet store that does not keep there males the females together and i have a male in my tank with her but is she pregnant
Well most of the time their already pregnant. Even of the shops sell them on their own it dose not meat that where they came from they were.
She look's like she's not currently, so i owuld hazzard a guess that if you get fry with in 3-4 weeks then she already was, if it's longer than that I's more likely to be your male that did the job.
That female is classed as a blond, as it's a cream colour type, these tend to have a less pronounced "Gravid spot" then most guppies.
But she will get much larger in the belly area, and you can sometimes see little eye's in the gravid spot.