I believe that the rapture will happen before the Tribulation.

Revelation 13:16-18 "And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads: And that no man might buy or sell, save he that have the mark, or the name of the beast, or the number of his name. Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is six hundred threescore and six." KJV.

1 Thessalonians 4:16-18 "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 raise first: then we which are alive and remain shall be caught up together in the clouds to meet the Lord in the air: and so shall we ever be with the Lord. Wherefore comfort one another with these words."KJV. This is the rapture.

Matthew 24:5 "For many shall come in my name, saying, I am Christ; and shall deceive many." KJV 

Matthew 24:33 "So likewise ye, when ye shall see all these things, know that it is near, even at the doors. 

Verse 36 "But of that day and hour knoweth  no man, no, not the angels of heaven, but my Father only." KJV. No one knows the day or hour. But we will know when it's near. Even at the door." No one knows the day or the hour. But we will know when it's near.

Matthew 24:6 "And ye shall hear of wars and rumors of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet." KJV 

Luke 21:11. "There will be great earthquakes, famines and pestilences in various places, and fearful events and great signs from heaven." NIV. 

Pestilences: it means diseases.

Revelation 6:2 "And I saw, and behold a white horse: and he that sat on him had a bow; and a crown was given unto him: and he went forth conquering and to conquer." KJV 

Revelation 6:4 "And there went out another horse that was red: and power was given to him that sat thereon to take peace from the earth, and that they should kill one another: and there was given unto him a great sword." KJV 

Revelation 6:5 "And when he had opened the third seal, I heard the third beast say, Come and see. And I beheld a black horse; and he that sat on him had a pair of balances in his hand."

Revelation 6:6 "And I heard a voice in the midst of the four beasts say, A measure of wheat for a penny, and three measures of barley for a penny; and see thou hurt not the oil and the wine." KJV 

Revelation 6:8 "And I looked, and behold a pale horse: and his name that sat on him is 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." KJV 

Revelation 4:1 "AFTER this I looked, and, behold, a door was opened in  heaven: and the first voice which I heard was as it were of a trumpet talking to me; which said, Come up hither, and I will shew thee things which must be hereafter."

Revelation 16:2 "And the first went, and poured out his vail upon the earth; and there fell a noisome and grievous sore upon the men which had the mark of the beast, and upon them which worshipped his image." KJV