It's possible, though it's a high enough score that it's more likely that it's not. Terri Warren, one of the leading experts on herpes, and who also does Western Blots, the confirmatory test, has seen a 14 be a false positive.
The IgM is a terribly unreliable test, and when it comes in, ignore it. Act like it wasn't done. It's wrong at least 80-90% of the time.
You will likely have a hard time getting a doctor to do a WB with an index value of 13.30. Terri will do it, though. You can contact her here - https://westoverheights.com/getting-a-herpes-western-blot/ You will have to self pay, and it's expensive. In the end, you will have to pay several hundred dollars.
Why were you testing?