If you think she is, then she is. I still cannot view the image. It takes me to photobucket, but it says the image is not available. If you would really prefer my opinion, you can try emailing me the picture at phishie@pethobbyist.com. Usually the female is really, really lethargic before she has her babies, so she should be resting on decor/plants/the bottom of the tank. If your tank is heavily planted (or even has quite a few hiding places) the babies should be able to hide if they come out before you have the box. Then just try to catch them and put them in the box. Pregnancy usually lasts about 28 days if I'm not mistaken. They will have more babies, I promise.
So if you don't get it on the first try, you'll get them the next.
If it makes you feel any better, my brother has had my guppy tank since I moved south, and he didn't have anything but a couple of plants and a few babies lasted long enough to grow bigger than the adult guppies' mouthes.
There's not much you can do without the breeding box/net.
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Phishie
"An ounce of prevention is worth a pound of cure."