How should I deal with this semi nsfw

How should I deal with this. So i proposed to my now fiancée and we are getting married in September already paid for. no hiccups small fights love of my life I thought. But this is the first problem I have had and worried it’s going to get worse. But anyways I came home after work and come to find she tells me she has thrown all my boxers away and replaced them with thongs/female underwear in general. Reasoning is they are “healthier apparently” some type of health benefit. But also claims they look way sexier. Any advice should I start looking into something else. Yes I have tried to talk to her about it she just insist they are better and says “i already threw your others away just give it a try”