Late menstrual. negative pregnancy test. possible uti. could uti delay my period? no recent stress or weight changes.

UTI's don't usually: cause delayed menses. Reasons for missed / late period include: an anovulatory cycle in which no egg is released, marked v or ^ in weight; eating disorder; Over-exercising (endurance athletics), stress, travel, significant illnesses, oral contraceptives & other meds, Illegal drug use, breast feeding, hormone imbalances and medical problems (i.e., PCOS). Pregnancy is #1 reason.