I worked for a couple of years before SAH and managed to save up a small chunk. DH has just recently caught his up to me (he went to school for much longer than I did).
As the SAH spouse, you can make IRA contributions in your name based on your wages earned by your spouse. It's not a lot (only $5K a year), but it's a start.
http://www.smartmoney.com/personal-f...sal-iras-7956/
You can also make non-tax-advantaged investments in your name.
In the event of divorce, I'd get myself a good lawyer. Your DH's retirement funds should be considered part of your joint assets and divided up accordingly.