Claire Le Goues sent me this nice article by Facebook's COO Sheryl Sandberg about how women should not plan too far in advance to slow down their careers before they actually have children. Sandberg says that this tends to slow down women's careers more than it should and gives the following advice:
Making decisions too early, trying to plan life too carefully, can close doors rather than keep them open. Any time you make a plan, you do it with imperfect information; the further in advance you make that plan, the less information you have. You never know how you will feel or what choices you might face. Take life one step at a time and don’t make decisions before you have to.
I think this article gives great advice about not letting perceived limitations get in the way of one's career.