To postopne or delay your period, you have to start taking progesterone
pill, named norethisterone
(usually 5 mg thrice daily) 3-4 days prior to expected due date and to be continued regularly with same doses till you want to delay it. Period will start within 7 days of stop taking the pills.
This information is very much sufficient to you and enjoy your pre planed vacation without any difficulty.
Be well & take care.