According to the Centers for Disease Control and Prevention, the flu vaccine is the best way to protect people against the flu and prevent its spread. The flu vaccine can also reduce the severity of the flu if a person contracts a strain of the flu that the vaccine did not contain. It takes about two weeks following vaccination for antibodies to protect against the flu.
Some dentists do not routinely prescribe antibiotics and still have successful implant cases. Their success rate may increase with using antibiotics, but may not (it is all a matter of odds). You are likely fine, but may consider a different antibiotic with fewer side effects.
Antibiotics Are No Longer Necessary for All Patients with Joint Replacements Before Dental Work. Basically, the new guidelines (or lack of guidelines) mean that not all patients with artificial joint replacements need to get premedicated with antibiotics before invasive dental work. I think that this is a good thing. Many times dentists had to premedicate patients when there was hardly any risk at all of infection.