Has anyone come out to their lesbian SO?

I am considering coming out to my lesbian wife and already sort of have in passing, but I'm not sure she is taking me seriously. She is proud of being a lesbian so of course, I have to take in consideration her feelings and what coming out might mean for her and I. I just am scared to lose her and I think she would be accepting but it's still a scary concept. I was just wondering if anyone had a similar situation and what their experience has been and how did you tell them?