Absolutely agree with Lyn. I can not imagine a US doctor injecting imported drugs in to your OH, it may not even be licensed for use in the US, and is definitely not a regular hypodermic, you need to be trained to use the applicator.
As Lyn says it is usually a 28 day course of tablets with the injection at day 14 (not day 28). So either delay the bicalutamide or start now but stay on it for 6 or 8 weeks, as long as zoladex starts about 14 days before last bicalutamide all will be ok.