Hello, Since you have had a normal period, the possibility of pregnancy is absolutely ruled out unless you have some form of uterine anomaly. The cause of the cramping pain could be due to some pelvic infection, tubal movement following ovulation or related to the gut. You would need further investigation to isolate and treat the cause. Please contact a specialist for a local exam, pelvic/trans-vaginal sonogram, blood counts and urinalysis. You would need an anti-spasmodic and a pelvic antibiotic along with local applications if needed. Please maintain genital hygiene and avoid intercourse until complete relief. Take care.