1) We don't have any joint accounts or any of the other financial aspects.
2) I didn't work in regional Australia for 3 months.
3) We don't want to get married for the sake of a visa, I've seen it suggested but it's just not something you should ever rush.
4) I'm working here in the UK so financially things will be okay.
Neither should having a baby!!! Well i suggest you consult an agent a baby on the way should surely be proof enough of your relationship. I would try go matilda most offer free initial consult.
Good luck i hope you get there speedy...