healthy guinea pigs

I was on the bed with my guinea pig, when she peed red. She peed again and it was an even brighter red. I'm really worried. We have a vet appointment tomorrow at 5pm but I'm really scared that this might be something serious. Please help.

Yesterday a lifted one of my piggies up to my ear, and listened to her stomach/chest area. I heard what sounded like crackling noises, light but definitely there. I couldn't hear them if I didn't press my head to her though. Today, I listened again, and they were the same, except for the fact...