Good evening everyone! Girls, can you please tell me if anyone has had…

Good evening everyone! Girls, can you please tell me if anyone has had something like this? We have a baby with a fever of 38.5 degrees. It happens, the little one didn't wake up in the morning, now we called an ambulance, and all they did was feel his belly, it's soft, go home, naturally, the child is capricious, but what calms me down is that we were struggling with diarrhea so the bottom is already in pain, today there is none, I think maybe it's due to the fever? Or should I be worried?