You should be able to document your income, expenses, and (hopefully) savings every month. If your income minus expenses is a positive number, you can relax a little. You still may want to work on your budget so you can save more for an emergency or retirement. If that number comes out negative, you could be in big trouble. Spending more money than you make means you must rely on credit. In turn, this means you are setting yourself up for more trouble because those credit card payments will get higher every month.
We have all heard the saying "Pay Yourself First" when it comes to creating wealth and a budget. But more importantly than that is to allow for a little mad money for yourself and your spouse. The lack of a little fun money is the number one reason most budgets don't work.