Read it more closely:
Joh 14:2 In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.
Joh 14:3 And if I go and prepare a place for you, I will come again, and receive you unto myself; that where I am, there ye may be also.
Jesus said, "I go to prepare a place for you." that is regarding those who die while Christ is in heaven. Jesus will eventually leave heaven: "I will come again". That is the second coming and here is the important thing: "I will come again and receive you unto myself; that where I am, there ye may be also."
So where is Christ after "I will come again and receive you unto myself"? Earth. He is no longer in heaven.
"I will come again and receive you unto myself; that where I am, there ye may be also."
This is what Jesus said. This is what some think he said:
"I will come again and receive you unto myself AND TAKE YOU BACK TO HEAVEN; that where I am, there ye may be also."
He never said when he came back, that he was taking anyone to heaven. He comes again to Earth and where he is on Earth is where the church will be.
Also in the same chapter:
Joh 14:23 Jesus answered and said unto him, If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.
Christ isn't returning to take anyone up to heaven to live with him and the Father but the opposite! The Father and Christ will end up coming here to make their abode on Earth with us! That's the opposite of the false pre-trib teaching!