The observation is rational and objective that due to biological reasons, women are more likely to conceive than men. A woman has to invest time and resources during childbearing that she cannot freely choose. The free market does not compensate this undoubtedly indispensable service to society.
She doesn't "have to" do anything she doesn't wish to. If she thinks the costs outweigh the benefits, she need not get pregnant or she need not carry the pregnancy to term. However, women have the option of conceiving if they think the benefits outweigh the costs, a choice men don't have.
The idea that this is somehow a disadvantage to women is only sensible if you see women as slaves to their biology who are powerless to make sensible choices. I utterly reject that premise.