Please Help Dads

Do you have a nanny? Little Eggplant is four months old. She had a fever yesterday and went to the hospital to check that it was a viral cold. The doctor prescribed Xiaoer Chai Gui antipyretic granules. Today the temperature has risen a bit, above 38.5 and even 39. What should I do? Continue to see the doctor? Or what?

I am asking here because I am taking the medicine and have a fever for the second day. I am not very familiar with the efficacy of this medicine. The doctor also said that you should only take Motrin when you are over 39 years old. Motrin seems to have many side effects.