You should see that the female goldfish appears fatter than usual due to the eggs she is carrying. The male will have white spots on his front fins and gill covers and will pay the female a lot of attention chasing her around the tank or pond.
they puke
They will be really fat.
It is physically impossible for a goldfish to burst on their own. It may be a female who is about to lay some eggs.
Goldfish don't get pregnant. They lay eggs (ova). If it is springtime in your part of the world then female goldfish could well have their ovaries full of eggs and be ready to spawn. If they do not spawn, the eggs will be reabsorbed by the body.
Goldfish do lay eggs. The eggs will attach to something in the tank or bowl until they hatch.
when you get it a mate.
Goldfish do not get pregnant like mammals do. Instead, female goldfish lay eggs that are fertilized by male goldfish. You can tell if a female goldfish is ready to lay eggs by looking for a swollen abdomen and a more rounded body shape. Additionally, the female may exhibit behaviors such as digging in the substrate or chasing other fish in the tank.
Your goldfish isn't pregnant, its just becoming full of unfertilized eggs. Truthfully you shouldn't worry about it, unless you have a male around who is ready to spawn, the female will just lay her unfertilized eggs and then eat them.
Goldfish are egg layers
Yes. Laying eggs is how they reproduce.
Yes.
yes