Can someone give me signs of pregnant fish?

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Best information and tips about help for pregnant women, help with pregnancy and pregnancy help
I want to know if my fish is pregnant. She is acting very strange. She is a guppy female.
Also give me a video or a good picture of a pregnant guppy if possible.

Like all livebearers when the female is in pregnant it will develop a dark triangular shaped gravid spot near her anal vent. As the pregnancy progresses this dark triangular shaped gravid spot will get larger and darker.
more info; http://www.aquariumpassion.com/profiles/freshwater-fish/livebearers/guppy.html
you can know when a baby comes out of her
You’ll notice that her abdomen is much larger and she will have a gravid spot.
http://www.youtube.com/watch?v=XqCzCRCMgyw&feature=related