Hi. Thanks for your query. Noted the history of taking a pill to avoid ulcer, has finished periods and had sex and the discharge os thick, sticky discharge, smelling like an antibiotic. My thoughts: The medicine to stop ulcer can not cause anything like such discharge, hence the cause must be local as you had sex at the end of periods causing changed bacterial flora of the vagina causing may be vaginitis. I would advise you the following: Consult your Gynecologist for internal examination tests accordingly to get a clinical diagnosis and get a course of an antibiotic and metronidazole, pessaries as asked by the Gynecologist.