My fiyonce has taken emkit after 72 hours of unprotected sex and now her cycle is 3 day late and pregnancy strip test done 6,7 time turns out to be negative... why is it so?

Because HPT can be inaccurate OR she is testing not pregnant because she is, in fact, not pregnant.

The "72 hour pill" also is tough on a woman's body and can cause her cycle to be delayed.

Did you read anything about the "72 hour pill" and its dangers before she took it?

Why do you use the "72 hour pill" instead of birth control?