you need to go on mymonthlycycle.com and they can tell you
how many days are in your cycle. or you can do it your self
by count the first day of your period for the month of may.
then count until june 09 when your period start.
per example. i have my first day of my period on april 23 then on may 30
my monthly cycle is every 35 days. i hope this answer your question.