Understanding various end-time events and their unique components can be confusing because there are so many “moving parts.” The Millennium is no exception.
During the Millennium Reign of Christ, two distinct classifications of people will live on the earth. One will consist of those who survived the great tribulation and were not cast into hell upon Jesus’ second coming. The others will be Christians in their glorified bodies who came from heaven to earth with Jesus for His second coming.
The group of people who survived the great tribulation will marry and repopulate the earth during the Millennium (along with those born during that time), possessing their natural, physical bodies.
However, the group of glorified believers will not marry or procreate during the 1,000 years (or ever) because they are "the bride of Christ” and will be like the angels in heaven (see Matthew 22:30). Their purpose will be to assist Jesus with governing those on the earth in righteousness and carrying out His divine will and justice.
I hope this information was helpful on this subject.
