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If you took precautions then the chances of pregnancy
are less.Secondly she got her periods although 5 days late but the bleeding is less if that is a worry then you can tell her to get a pregnancy test done for satisfaction.The periods can be delayed due to stress
or fear of pregnancy & the less bleeding could be due to hormonal
imbalance also.But for mental satisfaction & safety get the test done with a mornings first urine sample and if it is negative then relax.