I voted nursing. Let me put it this way. My husband and I both majored in a technical field which pays well. Do we always love our work? Not always, but we love that we make good money, have a nice house, know our kids will get what they need and we'll have the money to retire and/or handle unforeseen circumstances. Granted, I like the field I'm in, I didn't really choose it over something else in particular, but I've always been a practical person in that way. I know a lot of people making very little money, or going back to school and doing it all over again because they majored in music, or popular culture, or whatever. It's hard enough to get the degree the first time, it positively sucks to have to do it all over again because you can't find work in that field. I also know plenty of people who bought into the 'do what you love' philosophy and are disappointed to find they really don't love it that much anyway. Honestly, work is work it has its ups and downs. So much is dependent on your boss or coworkers, etc that even in a field you love you could hate it and in a field you hate you could love your work environment. And don't assume you won't like it. My brother majored in theatre originally before switching to business and he loves his job now.
I think if you could say your husband makes plenty of money to support you, pursuing a chancy career would be okay, but if you are concerned you might end up being the breadwinner, I think you have to go with something you know you can pay the bills with. FWIW, I wouldn't consider a midwife that choice, but if you get a nursing degree, if midwifery didn't work out you could fall back into traditional nursing. I'm a big fan of the fallback plan.
You CAN still do what you love, like someone said, you could minor in theatre, and/or you can get involved with local theatre groups. You could also do a side business in your ideal career, design costumes on the side, etc and if it takes off you can stop working.