in 35 days after last menstrual period is considered normal . Oral contraceptive pills
should be taken for 28 days(including 7 iron tab) .
As you had unprotected sex (incomplete oc pill ) and amenorrhoea so do Urine pregnancy
test .It ll show your pregnancy status .If positive then visit a gyne clinic . If negative then take oc pill regularly .if u miss any day then take double dose next day . If misses2cosequetive day then take other contraception
like condom .
Thanks n regards