I am a post tribulationis/ historic premillennialist. Did you know that the apostles and the first century church were post trib including John and his disciples Polycarp, and Iraenius? Google ''Historical Premillennialism'', you might find it very interesting. However I am not post trib because it is what they first century taught (I found that out after I realize the truth, it only confirmed what I already believed). I am post trib because that is what scripture teaches.
I have a 6 point proof of post trib on this forum already, but I will just share two with you for now.
#1 The bible tells us the rapture is at the coming of Christ.
1st Thess 4
15 For this we say unto you by the word of the Lord, that we which are alive and remain unto the coming of the Lord shall not prevent them which are asleep.
16 For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
#2 The coming of Christ is immediately after the Tribulation.
Matthew 24
29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
1+2=3, in other words if the rapture is at the coming of Christ and the coming of Christ is after the Tribulation then that would place the rapture after the Trib as well