I would no dare to login (if by some miracle they have released that official announcement about beta key accounts not being unable to login that was about to be published 8 hours ago) I dont want all my constructs blowing up on sight or my character deleting himself after pressing F or something. I will make popcorn and watch some streamers lose all their stuff and submit tickets that will be (not) solved after two months in the queue.
Go to official discord, #help-tech-support channel and ask for a teleport to your construct. Depending on the distance you could also try F4- > My location -> Constructs -> Right click in your construct and select "Fetch"