In Matthew 13, Jesus gives TWO parables, both of which carry the same message: the parable of the weeds (24-30, 36-43), and the parable of the net (47-52). That is nice--and indeed, it is probably why Jesus needed to illustrate His point with TWO word pictures, not one--because if the meaning you get is contained within both parables, then that is probably Jesus' intended meaning. But if it is only contained in one, then you are probably going off on an tangent somewhere.
The gist of the parables is something along the lines of, "The rain falls equally on the righteous and the wicked." But in the end, the angels will come and sort them all out. They will not be sorted now--but in the end they will be. The reason why they are not sorted now is because--in the first parable--you will accidentally pull up some wheat if you try and pull the weeds now. In the second parable, if you try and throw out the bad fish while they are still in the net, you will end up ripping the net and lose some of the good fish.
These parables were told 2,000 years ago, so even if the sorting happened over the span of 7 years, that is all the end of the age to them. All this talk about resurrections, or something happening first is going off on a tangent, and not inherent to both parables. The only possible reference to tribulation would be that the good and the bad both have to share the same soil, the same net--and one can reasonably infer that that will have ramifications for how this life is going to look like. But that has nothing to do with a 7-year Tribulation at the end--that's the tribulation we have always faced for all time. Believers have always shared the same soil with the non-believing. If anything at all, it weakly suggests post-trib, because pre-trib suggests that believers and nonbelievers will NOT share the same soil for a period of 7 years.