If you have time
to plan, such as for a specific event (vacation or wedding) controlling your cycle with birth control pills is probably the best option.
is often used to induce menses
, but not instantly...menses usually occurs after a 10 day course of progesterone. Some herbs--parsley/ginger-- are said to stimulate uterine contraction
as are mango/papaya and having sex
. Unreliable, though:)