If my extent completed on?

if my period finished on the 19th of june and its a 28 day cycle shouldnt it start on the 20th of julyIf my extent completed on?
You count 28 days from your FIRST BLEED DAY, not the later day you own your period. So amount out when your period started within June, THEN count 28 days and that should be your next length.
EDIT: Do the math. Count 28 days from June 13. That would put your period due to arrive somewhere around the 12th or so. Its NOT that tough.
you have to start counting from the first daytime of period
it depends on how long you've have your period for because if you merely got it, its stil varying
if it is a 28-day cycle, it will start earlier, you count from the year you get your term