Depending on the type of wine you're drinking the wine contains between 92-175 calories per glass of wine.
If you're already thin and not overweight then drinking wine should not really cause you much if any weight gain.
Some people who are already fat per say may notice a bit of weight gain from drinking wine but if you're skinny and at a healthy weight then you won't notice much if any weight gain from the wine you drink.
The calories contained in wine are a bit different than other calories contained in foods such as Pizza, Ice Cream etc so they don't cause weight gain like those food calories.
So drinking a few glasses of wine per week should not cause much if any weight gain.
I drank a few glasses of wine each week and my weight stayed the same and I didn't gain anymore weight.