I wouldn't over think it. Get your medical appointments done and if your wife asks what they're about, you can explain it. There is no shame in that. If she doesn't ask about them then discuss it when you have the medical results back.
I've posted this before, but when I was having U-IC issues going shopping with an elderly relative during the pandemic, I needed to wear a pull-up. So on my first day I held a bleach white pull-up in my hands (on purpose) as she came into the bedroom to tell me something. Normally, she notices everything. But on this occasion she said what she needed to say and started to leave without noticing the pull-up! So I just blurted out "I'm going to put my diaper on and go shopping with xxxxx this afternoon". Heh heh heh, it did stop her in her tracks, but she then came back and allowed me to explain. After that, all was fine and was no big deal. Don't over think it.