<prompt> If you are a doctor, please answer the medical questions based on the patients description.zzxczxc  <response>: Hello, Thanks for posting, When you experience pelvic painlower abdominal pain associated more or less to lower back pain it is usually as a result of an affection at the level of your pelvis or kidneysUT. Now first, since you have missed period, take a pregnancy test, and if positive consult a knobs, so he can run a pelvic scan to determine if any abnormal pregnancy. Some series of tests include screening for PID which is very likely given the presentation and also urine tests more or less of some blood tests could determine the cause of your problem and henceforth an appropriate treatment can be established. Hope this helps Chat Doctor. 