I found this
"God's perspective on time, revisited
God does not view time the same way we do. Instead, He is above time, and is present at every point in time simultaneously. This was discussed at length in Chapter 1, a discussion which will not be repeated here. However, an application of this principle must here be made to the problem of God's Son being begotten at a fixed time in human history.
Jesus was begotten the Son of God for us on a date which the best scholarship seems to indicate (although the Bible doesn't say) was in approximately 4 BC.
Before that, He had not yet been sent into the world to reveal the Father, to bring deliverance, to rule, or to do any of the other things on our behalf for which He was begotten into our world to do. That is, there is clearly a time before which, as we see time, Jesus was not the begotten Son of God. However, even before Jesus was begotten into our world, into our time, even from the beginning of time God was already present with Mary at the time of Jesus' begetting, and was already present on the day of his resurrection. God had already begotten his Son from the beginning of time, he simply had not been manifested to us, limited as we are by time. The problem of the "preincarnate Christ" exists only for us, not for God; it is a result of our limited frame of reference. Though the incarnation happened at a point in time, Jesus has always been the only begotten of the Father."
http://christian-oneness.org/about-the-Lord/chapter9.html
The Word always existed.
There was no begotten in eternity.
The 'Father' didn't precede the other members of the Trinity in eternity, as the Creed states.
That is neo-Platonic nonsense.
The Father is the "origin" or "source" of the Trinity. As such, God the Father is often called "God Unbegotten" in early Christian thought.
The begetting occured in time, when the Word became flesh, the only-begotten Son of God.
That part is wrong, the begetting didn't occur in eternity.
Begotten has the meaning of born, generated, or produced. God the Son is born out of the essence of God the Father. Just as a child shares the same humanness as his or her parents, the Son shares the essential nature of God with the Father. Since God is eternal, the Son, being begotten of God, is also eternal. The Son is often called the Only-Begotten God in early Christian literature, including in John 1:18 in many manuscripts.
This occured in time, not eternity.