Wrath (of God) and tribulation (of the church) aren't the same thing. Wrath is still to come, but tribulation has been happening for centuries now. Wrath is from God and tribulation is from humanity.
The Bible makes a clear distincion between trials and tribulations and the great tribulation, aka, the time of Jacob's trouble. At any rate the great tribulations is God's wrath, and the point still stands that His wrath would be upon His Son twice in anything but the pretrib view