OP, I'm going to toss you an alternative and maybe you can see if it resonates with you. I'm going to pre-face this with the fact that I had an unusual upbringing/role model in terms of drinking; I KNOW this isn't the norm nor am I saying it is, but I thought a different point of view might help you :)
So my dad raised me as my mom wasn't in the picture on a steady basis. My dad would drink around 4-6 beers on the weeknights and more on the weekend. I tried asking him about his habit when I was a teenager and he said "Listen mate, I don't spend money on hobbies, and I don't go out a lot. The way I relax after a 10 hour day (in addition to a 1 hour commute to work, and a 1 hour commute home). He then went on and asked me if I'd ever seen him miss work or his responsibilities from drinking, and I honestly hadn't. To add to this as long as I can remember since I was a little girl I had never seen my dad get sloppy, aggressive, or violent when pissed. He just got happier and more fun to be around. So I left my dad alone after that but continued to keep an eye on him silently. As far as I go when talking about drinking, I don't even drink socially. When people ask me if I drink I just say no, as its easier than telling them I have 2 pints no more than twice a year. It just isn't my thing, but I can respect those that do choose to drink.
I wanted to go over that as I felt it was relevant to what I'm about to say. If your drinking isn't affecting your work, home life, finances, or health negatively then I don't think imposing "Ill only drink on x days" is going to do you any good. In fact, I can see it hurting you. Sneaking whiskey because subconsciously you never wanted to stop drinking your wine is going to do way more damage to you than if you had stayed with your wine.
So instead of limiting yourself to certain days, why dont you limit the amount you can have per day? 5 ounces of red daily has amazing health benefits!
www.webmd.com/food-recipes/features/wine-how-much-is-good-for-you
A 5 ounce glass daily can lower your cholesterol, and improve your brain function. It will also keep you from sneaking sips of alcohol that doesn't have the same benefits. It might be worth reading about, the benefits of red wine, especially if you're going to speak with your husband.
So that's ny two cents, which is again based on the assumption that your wine drinking isn't affecting your life negatively in any way.