I've had left lower abdominal pain for 3 days. Menstrual cycle started 5/10, next expected 2/11.Is this a early sign of pregnancy, how soon can I test?

If.. If you are having pelvic pain pregnancy is a possibility. However there might be other problems causing your symptoms like for example an infection. Since I don't know what oner symptoms are related I cannot give you a more accurate impression of what could be happening. See your doctor for formal exam and diagnosis.