Hmm how do I prevent myself from fighting?

So last night for some reason I think my hormones are going crazy because me and my fiance got in a fight about salad dressing! It wasnt even a little fight it became a huge argument and we completely talked it over and relized how dumb it was and thinking about it today makes me kinda laugh. Honestly how do I prevent myself from fighting so much!? Like we really love each other but we are hittting a point where ifwe get in a big enough fight it could end things :o and i'm afraid that happen around the wedding since planning it, is incredibly stressful!