Hi there - this has been discussed several times before - look back through the threads in this section or personal experiences and you will see by the title. It really depends if you are peri-menopausal and how near to menopause as to whether sticking to oestrogen only or sticking to the progesterone part will delay the bleeding, as well as the timing of the last period before you go away. The only guaranteed way to delay a period as far as I know, if you are peri-menopausal, is to go to the doc and take norethisterone. Others may have other suggestions?
Hurdity x