How to snag term?

It's often the 20th of this month that I own my period,and I have to attend a really important experiment on the 20th which I cannot have period(it other hurts on the first day of my period). Today is the 8th... what can I do? backing... if you are on birth control, you can skip the placebo week and continue the hormone pills straight.
but for, there is disappointingly no surefire way to hindrance your period.
Taking "The Pill" can translation your cycle.