Thank you for your question.
Primolut n is used to prepone or postpone periods. The ipill is emergency contraception meant to be used after unprotected intercourse to prevent an unwanted pregnancy.
The better option is to use the combined oral contraceptive pill which gives excellent cycle control and is 99% effective at preventing an unwanted pregnancy when used for ongoing effective contraception. She can use the pill packets back to back without a break if she does not want to bleed at the time of the wedding or honeymoon. Her gynaecologist is he best person to guide and advise her regarding advantages and disadvantages of all these medicines.