You can always ask for an antibody test. If that is negative (which it could be, as many experts think the antibodies wear off rather quickly), then you could get a T-cell test. Latter might be the only way to ever prove you had it.
I haven’t bothered with those yet. I had the PCR test when getting sick.
I did inquire of my doctor if I should get the test in my recent physical last month. He told me that the tests aren’t sensitive enough to identify antibodies past about six months.