Hello, Three weeks ago you had spotting. You have irregular periods. You are sexually active and presently you are having abdominal pain. You periods are four days late. Abdominal cramps commonly occurs due to hormonal fluctuations. Such symptoms can occur due to gastritis, anxiety, stress, some infection from the bladder, bowel, ovaries and fallopian tubes, etc. You have done a pregnancy test and it is negative. However, gassy stomach and bloating along with a missed period may be indicative of pregnancy. Get a repeat pregnancy test done if you do not get periods. Stay away from addiction if any. Get clinically examined and assessed by a Gynae, get treated at the earliest. If not pregnant take well balanced home made diet rich in protein, calcium and iron. Take uterine tonics for regular menstrual flow. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician