My 5yr old has had stomach pain everyday, (not severe where she cries, but something she definitely notices and…

My 5yr old has had stomach pain everyday, (not severe where she cries, but something she definitely notices and complains about.) It’s been almost 2 weeks & it started with headaches and a low grade fever, now she is left with the stomach aches. I went and had her tested for COVID and strep, they were both negative.) she’s acting fine other than that, her normal goofy & energetic self. Does anyone have any clue? Her diet hasn’t changed at all, she eats good and has normal bowel movements for the most part. I will be setting her an appointment up Monday. Just seeing if anyone else has been through this.