Hello! Thank you for the query. First of all you need to know that as you are on antibiotics right now, any inflammatory disease in the abdomen can give less symptoms than usually. Moreover, WBC can be in normal range if the antibiotics are used. Lower right abdominal can be caused by appendicitis, urinary tract infection, ovarian cyst, pregnancy. Appendicitis should be ruled out at first. As the pain is still present, you should visit your doctor again, have blood tests repeated (WBC and CRP) and abdominal ultrasound. Sometimes it is more safe to perform appendectomy than wait and persist unsure. If you are a female, transvaginal ultrasound should be also performed as well as pregnancy test. Hope this will help. Regards.