Oh, hell, I had to start carrying my marriage certificate during my late spouse’s last illness despite us being a White, heterosexual couple because of the certain small but extremely annoying percentage of medical “professionals” who just could not believe that someone with his disability had actually found someone to marry him. Including a social worker who almost shipped him off to a nursing home without consulting anyone because she had convinced herself that I was his hired attendant and not his wife and thus had no say in what happened to him. Yeah, I made a lot of noise about that. A lot.
Anyhow - documentation, and having it on your person, is getting to be more and more important these days. Rapidly more important.
Definitely keep that marriage certificate on hand.