Rev 6:8 And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.
One Fourth of human population is killed in Rev 6:8. This is TWO BILLION persons. If this is not Tribulation, I don´t know what this is.
And we know from Matt 24:
Mat 24:15 When ye therefore shall see the abomination of desolation, spoken of by Daniel the prophet, stand in the holy place, (whoso readeth, let him understand: Then let them which be in Judaea flee into the mountains
And from Dan 9:27:
Dan 9:27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
That This Event (The Abomination of Desolation) happens 3 and a half years into the last 7 years. (There you have the common understanding that The Tribulation is 7 years)
Hence: The Tribulation starts way before The Abomination of Desolation. (which happens in the midst of the week).
And here it is where Paul enters the scene: We are not supposed to go Through The Tribulation because we are saved BY GRACE not by Works. We are not supposed to demonstrate that we are Faithful until Death.
Conclusion: We are Raptured Before The Tribulation starts. Before the Last Seven Years.
As I said before, we don´t have to depend on the semantics (of the original greek) of 2nd Thess. 2, to explain The Rapture before The Tribulation. We have plenty of biblical dots that places The Rapture before The Tribulation, before The Last Week of Daniel 9, Before The Last Seven Years.