I have done a legal ceremony, theorically you must be there 4 days before the wedding in order to make the blood test but in my case, I arrived the 3 days before and I have done immediatley the blood test without problem. I have payed extra 500$ for it (included blood tests for 2, marriage certificate translation, validation for marriage license, Judge transfer fee) I'm happy to have done the legal ceremony because I wanted the same date of the ceremony in the legal certificates.