i am 25 years girl not married. i am under medication for last 4/5 days for fever and cough, cold. doctor prescribed me azthral 500 alongwith other drugs. problem is my period started yesterday in an irregular way. its 15 days early since my period starts on 28-30 th day of a month and i never had the experience of irregular menstruation cycle. is it bcoz of the medication? plz help.