Thanks for the query to H.C.M. Forum .
1 As you mentioned that sex done just 7 days before menses date .
This means there is no chance of pregnancy
in normal circumstances ( 99 % correct).
2 The girl took emergency contraceptive pill prostinor 2
according to rule , so no chance of pregnancy.
3 The girl noted blood at her finger this is positive indication that she is not pregnant.
( no bleeding ) is there , so reason is only one , tension ( stress or anxiety
After 7 days ( late period date) get in home pregnancy test if any doubt.
In my opinion no chance of pregnancy , just relax and wait for normal period.
Good luck. Dr. HET