Let's look at the Scriptures you provided as a proof for the pre-trib rapture. I will only display those Scripture areas you quoted:
1.
Rev 12:1-8
12:1 And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars:
2 And she being with child cried, travailing in birth, and pained to be delivered.
3 And there appeared another wonder in heaven; and behold a great red dragon, having seven heads and ten horns, and seven crowns upon his heads.
4 And his tail drew the third part of the stars of heaven, and did cast them to the earth: and the dragon stood before the woman which was ready to be delivered, for to devour her child as soon as it was born.
5 And she brought forth a man child, who was to rule all nations with a rod of iron: and her child was caught up unto God, and to his throne.
The above five verses are actually a short, short summary of the whole Bible. That "woman" represents the Seed of the woman in Genesis that Christ would be born through. Those sun, moon, and stars symbols were first given in Genesis 37. The red dragon drawing a third of the stars (angels) with that old beast kingdom that had only seven crowns happened in the old world, when Satan first rebelled against God. By the time of the Seed of the woman was setup in God's Garden, that old serpent (dragon) was ready to devour her Seed. Her Child would be The Christ Who is to eventually rule all nations with a rod of iron.
So all that section of verses 1-5 is a summary of events from the time of Satan's old rebellion to the future "thousand years" reign of Lord Jesus after His return. There is nothing there about a pre-trib rapture of the Church.
6 And the woman fled into the wilderness, where she hath a place prepared of God, that they should feed her there a thousand two hundred and threescore days.
That 1260 days period is about the first part of Daniel's symbolic "one week" of 7 years. The tribulation period is the latter one in verse 14 where the woman is protected for 1260 days from the waters as a flood out of the mouth of the serpent.
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,
8 And prevailed not; neither was their place found any more in heaven.
KJV
That event is for when Satan as the coming Antichrist will be booted out of the heavenly down to earth and will be the pseudo-Christ working the great signs and wonders in Jerusalem. That... is when the time of great tribulation begins, as shown in the 13-15 verses. So no pre-trib rapture message there at all.
2.
1 Cor 15:51-52
51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
KJV
The pre-trib rapture school teaches that "last trump" event doesn't happen when Jesus comes for His Church prior to the tribulation. They instead teach that event is for Jesus' coming 'with' His Church after the tribulation. They teach TWO SEPARATE COMINGS of Christ Jesus, which of course is false, for God's Word only supports ONE return of Christ to gather His Church and defeat His enemies.
Trying to use that 1 Cor.15:52 Scripture as proof for a pre-trib rapture shows you don't even really know what the pre-trib rapture school teaches regarding their own doctrine!
3.
Isa 26:17-21
17 Like as a woman with child, that draweth near the time of her delivery, is in pain, and crieth out in her pangs; so have we been in thy sight, O LORD.
18 We have been with child, we have been in pain, we have as it were brought forth wind; we have not wrought any deliverance in the earth; neither have the inhabitants of the world fallen.
The 'travail with child' metaphor is for those who are deceived. Apostle Paul showed this in 1 Thess.5 about those who will be saying, "Peace and safety".
19 Thy dead men shall live, together with my dead body shall they arise. Awake and sing, ye that dwell in dust: for thy dew is as the dew of herbs, and the earth shall cast out the dead.
20 Come, my people, enter thou into thy chambers, and shut thy doors about thee: hide thyself as it were for a little moment, until the indignation be overpast.
21 For, behold, the LORD cometh out of his place to punish the inhabitants of the earth for their iniquity: the earth also shall disclose her blood, and shall no more cover her slain.
KJV
That is about the LAST DAY when Jesus comes to gather His Church AND defeat His enemies at Armageddon (Rev.16:15-17; Rev.19:11-21). For that to be about a pre-trib rapture, it would have to show Jesus coming to gather His Church PRIOR to the tribulation that happens way before all that. So you cannot simply use that for a pre-trib rapture theory.
4.
1 Thess 5:2-4
2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
3 For when they shall say, "Peace and safety"; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
4 But ye, brethren, are not in darkness, that that day should overtake you as a thief.
KJV
Those events, when the deceived will be saying that, "Peace and safety", is DURING the tribulation. That "sudden destruction" upon them comes on the day of Christ's return to gather His Church, and that day He does that is the LAST DAY of this present world, not prior to the tribulation. That is when that "day of the Lord" per the OT prophets will happen, on the LAST DAY. So you are confused about that Scripture also. It is not supporting a rapture prior to the tribulation, which is what the pre-trib rapture doctrine teaches.
5.
Mic 4:9-10
9 Now why dost thou cry out aloud? is there no king in thee? is thy counseller perished? for pangs have taken thee as a woman in travail.
10 Be in pain, and labour to bring forth, O daughter of Zion, like a woman in travail: for now shalt thou go forth out of the city, and thou shalt dwell in the field, and thou shalt go even to Babylon; there shalt thou be delivered; there the LORD shall redeem thee from the hand of thine enemies.
KJV
That was historically about Judah's captivity to historical Babylon by Nebuchadnezzar. God would eventually call Cyrus to free them, and He called Cyrus "His anointed" in Isaiah 45:1. Cyrus represents Jesus coming to free chosen Israel from a second metaphorical Babylon captivity, if you're wanting to use that as a blueprint for the end. It does not support a fly away pre-trib rapture though.