My husband and I also used to be faithful pre-trib believers until through more study we realized there were too many holes in the theory that could not be filled.
I just know there will be a time that we will be "snatched" or caught away together to meet Jesus in the sky - believe me I look forward to it.
To me, there is just no way to tell the time or date that this will happen as there are scriptures to support all the theories!