It's a tough call. Your wife has a good point, but as symptoms don't appear for 5 days, the people who are contagious now won't even know it. But this isn't going to go away any time soon, so how long realistically would you chance going without blood tests??
If I was in your position, I would go Monday as it's probably going to be the "safest" period for a long time. Then if everything seems stable, I'd try and leave my next blood tests as long as possible.

I was fortunate with my blood tests as all clinics have switched to telephone (except for the most recent transplant patients), so the blood test room was empty with nobody waiting.