See your primary care Physician more urgently if you are having nausea or vomiting or fever or chills. A review of your history and probably some diagnostic studies may be warranted.
I am sorry a simple answer is not available but again if fever or chils, nausea or vomiting a quicker more urgent work up is necessary.
These limited symptoms can be caused by Gastrointestinal system (colon, appendix, stomach, or hernias); Genitourinary (bladder infection, cystitis (bladder inflammation), Pelvic Inflamatory Disease, Uterine issues (fibromas, inflammation etc...). Severity and associated symptoms are important then a work up can be completed based on your responses.
Hope you get better soon. See your PCP or urgent care doctor for an examination and complete history review.