I Need An Urgent Answer Please, I Am A Female,

I need an Urgent answer please, I am a female, the first day of my last period was on 4/4/2015 .. my period cycle is 27-28 days .. I had unprotected sex (condom tear) on 20/04/2015 .. I need an emergency contraception which is not allowed in my country .. can I take the marvelon .. and how much is the dose to prevent the pregnancy as I am a mother for 1 year old baby (Not on breast feeding). Please advice as currently I can not consult my doctor due to uncovered by a health insurance.