is my frog pregnant?

Question
hi Thea, i have had a Firebelly toad for about 12 years now. about a month ago, it had started to make a noise kind of like a bark. my mother thought it was lonely so we went to the pet store to buy another one. as soon as we put the new toad in the tank, the original frog that we had grabbed the other frogs back legs. i knew it must have wanted to breed. i also noticed that only one of them was making that barking noise. my father and i both agreed that it was probably a male and a female. today i got back from school, and the female was fatter then usual, especially on its sides. it was spinning in the water non stop so i nudged her back on land. when i put her back on land, she was lopsided on her right side. she continued to spin to her right side and is loosing her balance. could she be  pregnant? and if she is should i separate the male from the female and tadpoles?
                                   please reply,
                                         Hunter

Answer
Hi Hunter,

I'm not sure from your question whether you are aware that frogs (with only the rare exception) engage in external fertilization. The females do not carry fertilized eggs inside their body. Fertilization and egg laying take place during amplexus (the leg grabbing) but it happens outside the female's body. Amplexus triggers her to deposit the eggs and the male covers them with sperm.
Female frogs are often more rounded then the males and if she is carrying eggs that she is about to lay that would certainly add to her roundness. That additional "fatness" should still be fairly soft though, she should not seem bloated, hard or "inflated". The disturbing part of your description is the spinning and lack of balance which almost sounds like a neurological problem. My hands-on breeding experience is with treefrogs but nothing that I have run across in my reading over the years about breeding Bombinas mentions that as part of normal breeding behaviour.
You have had your male for many years so your environment is obviously fine. Frankly, I would suggest separating her from your male now until you see how this resolves. Whatever issue is going on with her to cause the spinning, she doesn't need the added stress of an eager male as well! You also don't want to lose your male, if this is infection based.   

To answer your last question, you really should separate the eggs from both the adults before they hatch, which takes about a week. You will get a much better survival rate if the eggs are moved into their own contain. The water should not be allowed to become too stagnant which reduces the oxygen level. An air stone on a small air pump will keep the water well oxygenated. Provide several aqatic plants for the tadpoles to cling to after hatching and treat them like small fish. Once they start to develop legs you need to provide them with surfaces like horizontal plant leaves that allow then to get out of the water.
You will need to raise the froglets separate from the adults as well. The froglets will be quite small and can be physically injured and likely cannibilized by the adult frogs. They will need very small food like fruit flies and hatchling crickets.