First, stay calm. Don't jump to conclusions immediately. Try to have an open and honest conversation with your wife. Ask her what was going on in a non - accusatory way. Maybe there's a perfectly innocent explanation for what you saw.
One possible scenario could be that she was planning a surprise for you. Maybe she was preparing a special dinner or decorating the house for an occasion. Another could be that she was on the phone with a friend sharing some interesting or funny family stories.
Well, you could start by greeting her with a warm smile and a big hug. Maybe offer her a drink or something to eat if she looks tired. If there's a particular story you want to share with her, now could be a good time to start the conversation in a relaxed way.
One possibility is that she was in the process of cleaning out old clothes from their closet. He caught her going through all the memories stored in there, and they ended up reminiscing about different events associated with those clothes. For instance, a dress she wore on their first date or a shirt he had when they went on a memorable trip.
It could also be for a more private or sexual reason between you two. Perhaps she's trying to spice things up in the bedroom. Another possibility is that she had some sort of medical procedure or check - up in that area and shaving was required for it.
First, don't overreact. Just approach her casually and ask her about it in a non - judgmental way. For example, you could say 'Honey, I noticed something different. Is there a reason?'.