Virgin here brown discharge occured at 19th day cycle. last period started on sept30. my bf rubbed his penis 2 my anus & never inserted. irreg cycle ?

See below: Brown spotting before a period can occur due to a change in cycle length, birth control usage, ovulation, hormonal changes, infection, injury or other disease-related causes. In general, isolated spotting indicates no immediate health concern. However, if spotting is frequent, accompanied by pain or other symptoms, or continues for >3 months after beginning a birth control regimen, see your MD.