Yesterday I received an offer from a company and signed and sent it back. The job does not start for another three weeks and I had an offer to work from home for a fraction of that salary. 

So I figured I would do it for the three weeks and then quit because i have no other source of income at this moment. 

Well I filled out all of my paperwork to this employer and had accidentally added the one from the other company. They of course caught it and told me. I then told them that it was an offer I decided not to accept. 

I mean I can hardly tell them well I will go there in three weeks. Now I am terrified that they will contact that employer and tell them I sent them their offer letter. 

I am not sure if I have any right or what I can do. I live in Florida (right to work state)