How To Induce Periods?

hello doctor. i missed my periods twice and still waiting. i had sex with my fiance thrice and took the emergency contraceptive pill also thrice. i have done several pregnancy tests at home.they all came out negative.then i went to the doctor for the test.her report also says that i m not pregnant.but she made me scared that some people get to know it later.i dont feel anything related to pregnancy.she also told me that it can be due to harmone imbalance.what should i do to get my periods. i m going to get married in november. please help i dont want to get pregnant.