Job Transition As An Expectant Mother

I am 2 months along and so far the pregnancy is a stable and healthy one. I had plans pre-pregnancy for continuing education and a career move. Now with the surprise of an unexpected pregnancy, my plans have obviously changed. Any advice or recommendations for planning to take maternity leave and transitioning into a new job? How much should I discuss if anything with potential employers? I know there are no guarantees for a full term pregnancy.  I will be a single working mother and this is all a bit intimidating.