My daughter's tummy started hurting today, specifically the lower part – she was pointing to her pub…

My daughter's tummy started hurting today, specifically the lower part – she was pointing to her pubic bone area. At first, we thought she had food poisoning from the yogurt she ate this morning, but then her temperature spiked to 38°C (100.4°F), and we rushed to the hospital. We waited there for three hours, and her fever didn't even go down. The surgeon examined her, took a look, collected two vials of blood and a urine sample. The blood work showed nothing alarming, but he didn't like the urine results and sent us to the children's hospital. There, they also couldn't tell us much, saying we need to re-test the urine in the morning. They want her to be admitted to the hospital, but they won't do anything for her at night; she needs an ultrasound, and as you can imagine, they don't do those at night anywhere. Tomorrow, if there's an opening, I'm just shocked, I'm in such a panic. It's one thing if it's a bladder infection, but what if it's appendicitis? What if the surgeon missed something? I can't sleep.