I took a My Heritage DNA and it was pretty much as I expected apart from 3% Eastern European which, at a stretch, I can imagine might relate to my father's side of the family.
However, my husband who knows his family history back to the 17th century took their test and got a rubbish result. He was so cross that he took the time to argue with them. In particular, he is French Huguenot on his mother's side and eventually, My Heritage admitted to him that they didn't have access to any French data because, as posted above, the French won't allow DNA testing. So the answer to the original question is, I suppose, be very suspicious. I'm very doubtful of suggestions of linkage that quote 0.5% and so on.
I originally did my family history 25 years ago when it wasn't possible to use the internet. I've noticed that the proliferation of researchers and databases now means that mistakes creep in very easily. I recently came across an American family tree where they'd seized upon an uncle of mine and inserted him in their tree which was a complete fallacy, they had just grabbed a suitable looking date and name and added him!!
Do you still wear you original wedding and engagement ring