Only 1 return can be accepted. The second return will reject. Did the tax preparer efile or mail it? Did you efile yours before he did? You have to find out which return was accepted first and the IRS processed. Better log into your IRS account and see what they have filed for you.
You can request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript
Or get a complete federal tax return from the IRS by completing Form 4506
https://www.irs.gov/pub/irs-pdf/f4506.pdf
