Hence, I would suggest you wait until she is one week post period date
, then if she still does not get periods let her take a pregnancy
test. If the test is negative, and she doe not get period, wait another 3-4 days and then get a blood HCG test done. If this is negative, then she is not pregnant, and in all probability will get her periods. However, since the delay would be more than 10 days, it would be best to consult a gynecologist.