Missed period for 3 months and pregnancy test shows negative , stopped yaz plus 8 months ago , no nausea , here and there a headache and slightly more bathroom trips ?

Missed period ?'s: A long absence of menstruation (aside from pregnancy) can be caused by polycystic ovarian disease or extreme stress (home, school or emotional) and rarely by pituitary tumors. See your gyn for a serum HCG test to be certain about pregnancy, a pelvic ultrasound for detection of ovarian cysts, and a serum prolactin to discover a pituitary tumor.