Is 42 days period cycle normal ?

If the "42 day cycle " is a regular occurence, it is possibly "normal" for you. If this cycle is rare or only occasional, stress can delay ovulation (job, school, emotional) which will delay onset of menstruation. Ask your gyn provider about low dose oral BCP's, which will cause cessation of ovarian function, and generally provide regular "periods", if taken punctually as directed.