Listen, if I haven't gotten it in the last 10 days while my wife has been positive and not really taking any precautions inside the house, I can't see how I could possibly get it that way. Most likely I have it without any real symptoms. I'll probably try to get tested at some point before then anyway.
This is a very common misconception, and is probably part of the confusion and misinformation surrounding the virus.
If you share close quarters with someone positive, you have a 10% chance of catching it. On the flip side, even without sharing close contact with someone, there’s a significant chance of catching it through short casual contact. Of course not close to 10%, but the more interactions you have with people, the higher the odds go. I don’t have the source right now but will try to edit it in later.
So everyone who shares quarters with someone positive: there is a very decent chance you have it, and therefore you need to be extra careful. However, do NOT assume “I for sure have it”, because believe it or not, odds are you don’t.
Certainly, the more interactions you have with the infected person the higher the chances. If they sneeze into your mouth, you probably will get it. But you can still not have it, and get it from someone else, so still be careful!