Would Periods Be Regular After Taking Femilon?

hi Iam 25 yrs old. i have an ovulation pain so my doctor preferred me to take femilon from the 2nd day of periods. my last period starting date is 11th of may.how would i get my periods again after the completion of my 21 tablets. iam planning for trip to canada on 4th of june.so its important to know how would i get my periods again?