When I log into my account for 2018 it doesnt show my PDF file of my tax return. In fact, it says that I need to start a new one when I have already filed it on march 17

I have cannot find my 2018 tax return file. I completed it and it was accepted on March 17, and now  it is nowhere to be found on my account!! This is very worrying because I need it for my parents tax return.