How can you tell when your guppy is pregnant?

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I’ve got 2 females, yes, I’m prepared… But my one female is alot plumper than my other female… How can you tell if they’re pregnant? And how long are they pregnant before they have fry?

A pregnant guppy will look much like this one:
http://fins.actwin.com/fresh-pics/guppy-female.jpg
Notice the dark spot at the end of her belly, that’s the gravid spot and will show on any pregnant guppy. here’s another example:
http://aquariumhobbyist.com/guppies/gravid.jpg
Normal gestation for a guppy is about 28 days from the day she got pregnant. That can easily vary by 10 days though.
MM
they look like they’re gonna explode!!! i’m told that when the bottom of their big bellies look flat instead of round is when they’re about to have the fry.
they do get plumper. they also get a dark spot on their abdomen that gets darker as it gets closer to delivery. i believe the pregnancy can last 3 months from conception, but i’m not sure about how long after you see physical signs. make sure the fry will have a good place to hide once born. good luck!
look for a dark spot on her belly
It blows up like a balloon.
It looks like a balloon
They start to get fatter and have a black spot (gravid spot) just above her anal fin. It is impossible to tell when they are going to give birth, so just per her inside a breeding trap/tank when you start to see signs of pregnancy.
~ZTM
back of abdomen gets dark as the fry develope( ifnot an opaque color) usually have fry once a month but if young may be 3 mo before first time having young then approximately every 30 days will have a new bunch of fry, water temp also has a lot to due with length of gestation 78-80 degrees is best