Oral gear or injection? Hard to say, I've even trained through sickness.
Either you can inject now and get it going in the blood stream and wait for you to get better, or you can wait for the injection based on the possibility that you may get slight gear flu depending what it is, which will make your sickness seem worse.
As long as they are not orals I would not worry really, personal choice. If they are orals, then that + other drugs may hit the liver a bit hard, sometimes I skip days of dbol if I would have to hit other stuff.