HI, I just got my first injection, and the office gave me a whole sheet of paper about what to look for, what might be on my eye. Also gave me a small bottle of drops if my eye felt scratchy. Clearly spelled out I could shower, but should avoid getting water in my eye for 3 days. I'm surprised all doctors don't give something like that out.
But I am lucky enough to live near one of the top hospitals in the country, and I was also lucky enough to see a top doctor there.
Good luck.