Think about this too: Any animal who suffers a heatstroke can have PERMANENT brain and/or neurological damage if medical attention is not sought out immediately after the event occurs. Every minute that you're sitting there thinking that your chinchillas are fine because they're looking better, eating, drinking, etc. they are incurring more brain damage that is probably irreversible. Even if your pregnant momma doesn't show any signs of heatstroke, she may be suffering (they are prey animals after all, so they're very good at hiding pain and suffering.) Not only that, her babies are suffering. The vast majority of vets will allow you to do a payment plan to do a visit, and if your chins need surgery, sub-cutaneous fluids, etc. at a hospital they can do it as well. Please, please, please take them to the vet or get them to someone who can help them. This isn't about you or your monetary situation anymore, this is about the lives of your furbabies and their unborn children.