“Consenting to sex doesn’t mean consenting to pregnancy.”
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(DiamondConfident1811)
Technically PC is right that consenting to sex doesn’t mean consenting to pregnancy. But the risk on getting pregnant is inherent to consensual vaginal sex. Thus consenting to sex is consenting to the risk of getting pregnant.

(phi16180339)
This is a much better comparison than stuff like “consent to driving is consent to a car crash”. It’s totally possible to consent to an action, and not to consent to accidents that may occur from that action. However, pregnancy is not related to sex in this way. Pregnancy doesn’t happen when sex goes wrong, like how car crashes happen when driving goes wrong. Pregnancy happens when sex goes right, just as digestion happens when eating goes right. If you consent to an action, you do consent to the end of that action, even though you don’t consent to the risks of that action.