A viral load of 62 is still considered "undetectable" and non infectious. The partner study used 200 as their definition. The term "undetectable" is really obsolete. There are tests that can detect a viral load of 1. In the US, Quest Diagnostics uses a test that goes down to 20 so <20 is "undetectable". Labcorp uses a test that goes down to 40 so to them <40 is undetectable. A reading of 62 is usually considered a 'blip". I have been "undetectable" since 20212 but every couple of years I have a blip. In 2020 I had a reading of 138, 2 months later it was 41 and 3 month later it was <20 and stayed that way since. I chalk the 138 to my doing the blood draw right after I had my flu shot and that can cause a blip. Your Dr should test you again in a couple of months to make sure is isn't trending up but you and your partner should have nothing to fear from a value of 62.