Bodily autonomy is a fundamental right

There is no legal precedent to force someone sacrifice their body to save the life of another. That's why organ donors are so important - we require them to agree while they're alive to donate their organs to help others when they're dead. Consenting to sex is not the same as consenting to parenthood. At the end of the day, abortion is a medical procedure that has nothing to do with you, unless you're getting one yourself.