How long should a vaccination fever last?

Hey all!

Concerned parents here looking for some insight.

My daughter just had her 1 year vaccinations on Wednesday and developed a mild fever that same night. She has been ranging from 98.X to 101.X since then and just measured 100.7 on day 4. She is otherwise happy, playful, and eating/drinking well.

We plan on sending a message to her pediatrician if the fever continues to tomorrow but wanted to get the experience from other parents out there. Thoughts? How concerned should we be?