Vaccines appointment

Got my appointment to get the vaccines on July 18th. I saw on internet that I need to get those at least 10 days before departure, so I am fine. The problem is that I need an attestation that I have enough antibodies to not get the vaccine against Hepatitis B... So now I got to go to my doctor and pay to get the attestation so I don't have to pay for the vaccine... Aaaarrrrg!

EDIT: I received a call, my appointment has been moved to July 6th, the doctor won't be at work on the 18th.