Hmmm. This really depends. But first of all I want to congratulate you for realizing your situation and taking steps to get out of it. It will depend on the cost of living where you are, and any childcare needs that you may have. As a nurse, you can make a modest income, but with increasing experience and certification you can make more.
In the end, I would say yes, at the very least being a nurse will be one of the more stable, guaranteed forms of income a single mom could earn. Good luck!!