I believe that it will be post tribulation. Believers are "not removed" from the earth before the times of trouble or tribulation but after. Jesus himself said the following:
"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:
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. 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.
Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:
So likewise ye, when ye shall see all these things, know that it is near, even at the doors.
Verily I say unto you, This generation shall not pass, till all these things be fulfilled.
Heaven and earth shall pass away, but my words shall not pass away.
But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.
But as the days of Noah were, so shall also the coming of the Son of man be.
For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noe entered into the ark,
And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.
Then shall two be in the field; the one shall be taken, and the other left.
Two women shall be grinding at the mill; the one shall be taken, and the other left. Watch therefore: for ye know not what hour your Lord doth come. (Matthew 24:29-42 - emphasis on Verses 31 & 40-41).
Further information to show the events after the fact rather than before - the dead in rise Christ first, then those believers who have survived:
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: 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. (1Thessalonians 4:16-17).
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