What about the 7th trumpet? Does that indicate that it occurs at the end as well?
No it does not. That is why talking about "the end" is misleading.
THE SEVEN LAST PLAGUES: SEVEN GOLDEN VIALS OF THE WRATH OF GOD
We need to start with Revelation 15 which presents the 7 last plagues and end with Revelation 19 which is the Second Coming of Christ. But not "the end of the age".
And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God... And one of the four beasts gave unto the seven angels seven golden vials full of the wrath of God, who liveth for ever and ever. (Rev 15:1,7)
SEQUENCE OF EVENTS FOR VIALS
1. And the first went, and poured out his vial upon the earth; (16:2)
2. And the second angel poured out his vial upon the sea (16:3)
3. And the third angel poured out his vial upon the rivers and fountains of waters (16:4)
4. And the fourth angel poured out his vial upon the sun (16:8)
5. And the fifth angel poured out his vial upon the seat of the beast (16:10)
6. And the sixth angel poured out his vial upon the great river Euphrates (16:12)
7. And the seventh angel poured out his vial into the air; and there came a great voice out of the temple of heaven, from the throne, saying, It is done. (16:17)
THEN COMES THE JUDGMENT OF "THE GREAT WHORE"
And there came one of the seven angels which had the seven vials, and talked with me, saying unto me, Come hither; I will shew unto thee
the judgment of the great whore that sitteth upon many waters: (Rev 17:1)
THEN COMES THE FALL OF BABYLON (WHICH MAY ALREADY HAVE FALLEN)
And after these things I saw another angel come down from heaven, having great power; and the earth was lightened with his glory. And he cried mightily with a strong voice, saying,
Babylon the great is fallen, is fallen, and is become the habitation of devils, and the hold of every foul spirit, and a cage of every unclean and hateful bird. (Rev 18:1,2)
THEN COMES THE MARRIAGE OF THE LAMB
Let us be glad and rejoice, and give honour to him:
for the marriage of the Lamb is come, and his wife hath made herself ready. (Rev 19:7)
THEN COMES THE SECOND COMING OF CHRIST (COSMIC EVENTS NOT MENTIONED HERE) And I saw heaven opened, and behold a white horse; and he that sat upon him
was called Faithful and True,
and in righteousness he doth judge and make war. (Rev 19:11)
And this is just "the beginning"! The seven trumpets are mentioned in Revelation 8.