I am currently on H4 and I have an employer ready to file for my H1. I was on an H1 before I went to H4 for about 2 years and so I do not fall under the quota. My employer told me that I can start working on an H1B receipt but I strongly feel that I can not and that I would have to wait for the approval based on H4 to H1 portability. Can I actually start working on receipt without an approval? If I do that, what happens if my H1 petition gets denied? Do I fall under the same visa I was before I applied for my H1?