Suggest Remedy To Avoid Pregnancy After Unprotected Sex

I had unprotected sex with my girl friend 3days ago and she is scared she might be pregnant.she came up with this dream that she was breasting feeding a baby,she said the last time she had a dream like that she was pregnant and now she is scared.She is expecting her period next weekend,so I thought of giving her gynaecosid,she said it wn't have any effect again that it works like postinor,but I still want to give her gynaecosid,the question is how effective will the drug be in making her see her period or is it late to take that ?Secondly,I dn't want her taking contraceptives because she has prolactine issue.I am just confused and dn't knw the right step to take,I earnestly await your response.