Goldfish do not get pregnant.
You can continue to keep, and care for goldfish while pregnant. Goldfish are not edible, at least not to humans, so as long as you are not eating them, you will be fine.If you mean the goldfish crackers, then those are just fine to eat as well.
There is nothing unsafe about caring for your fish while pregnant, so you can continue as normal
yes, dragonfish can live with any other docile, non-aggressive fish.
Some goldfish are male, while others are female.
While a goldfish may have a chew on something that falls into your tank, it's not recommended to purposely feed them spiders (or flies, or any other bug).
No, do not eat activia yogurt while pregnant. Just eat the other kind of yogurt.
Yes, any other time she can not get pregnant. I have never before heard of dogs getting pregnant while they were not in heat.
Goldfish fertilize externally, so that's not a problem. The female just lays eggs while the male fertilizes them afterwards. After that, it would be best to remove the eggs as soon as possible because they can easily be eaten by accident. Unlike human births, goldfish births don't require a lot of fatherly support. On the other hand, some other fish like bettas do have males that protect their eggs. In that case, it would be best to remove the female after eggs are laid. It's important to note that fish breeding is quite difficult and is usually done by experienced breeders.
We have had 2 hatchings of goldfish and they usually start changing to gold, or any other colors that they will be, at a month old, and will continue to change color while they grow.
yes
no because she is already pregnant by the other male
You will not menstruate while pregnant. But there can be a large number of other reasons that blood flows from the vagina even while pregnant all of which require medical attention.