Depending how old it is, if it is an adult female and it is in with male guppies then it is very likely that it is pregnant. (:
All that is needed is a male guppy in with her.
it may be a femake or a FAT guppy
like human that is pregnant.
Because the guppy have baby inside it stomch
yes.
large stomach.
Depending on how fast the female grows, it could could get pregnant as young as 8 - 10 weeks old.
Your guppy will be pregnant if it has been in a container with a male since it reached maturity. A none pregnant guppy is an unusual thing. She will develop a belly and also when seen from behind she will have a dark spot visible deep inside her on either side of her vent. (the gravid spot)
oldest living guppy was 340 years old
Under normal circumstances every female guppy you come across will be gravid (pregnant). My advice is don't worry about it she will be pregnant.
No, you do not have to turn the filter off. I just bought a pregnant guppy, and i just cut off the leg of some old tights, and wrapped them around the filter so the babies can't be sucked in. It's easy, and there's no mess. Hope this helps!