Hi. Thanks for your query. Read and understood your problems: Severe Abdominal pain all over week and hurts on urination - over a week late on periods - You had sex and did not use condom this Saturday- if within this week means you might have been in a safe period and your boy friend says he did not cum in . I would advise you the following: Consult your parents as you are minor and this answer is out of humanity of a Doctor for social responsibility. Get pregnancy test. If it is negative , nothing to worry about. Otherwise follow whatever your parents say so. The possibility of Severe urinary tract infection has to be borne in mind. Get the following tests: Blood CBC for infection Urine : Culture and sensitivity, routine and microscopy Ultrasonography of the abdomen. A course of an antibiotic and supportive medicines till you are cured.