But this is of course false. Waivers to fundamental rights must be explicit. You might as well suggest that drivers involved in traffic collisions do not have grounds for claims with their insurance companies -- since after all, a collision is something that could arise from operating a vehicle on public motorways.
A poor analogy. Consensual sex leading to pregnancy would be more akin to driving drunk and then having no grounds for an insurance claim.
The individual has performed an action that they know has a high degree of probability to result in "X."
Consenting to the possibility of something is not the same as consenting to the thing that is possible. This should be obvious. It is possible that I could be struck by a falling airplane when I go outside for a walk. I am not consenting to be struck by said plane when I consent to its possibility by going outside.
This again is a tenuous example.
What if you decided to go for a walk on a landing strip? Since you're aware of the high degree of danger involved, you've consented to the possibility of being struck by a plane.
There is a big difference between, as you've stated, undertaking what should be a low risk exercise leading to an unintended and unforeseen consequence versus a high risk exercise that has an inevitable and foreseeable consequence.
Pregnancy is a natural, biological, and evolutionary consequence of sexual intercourse. To have consensual sex then claim the pregnancy is "unconsensual" or, as you put in another post, "an unwelcome fetus violating the body of the mother" grossly misrepresents the scenario.
A pregnancy as a result of rape, incest, or birth control failure I would say fits your descriptions. However, should someone have consensual and unprotected sex they do not get to play the victim when that activity inevitably leads to pregnancy.
We're in agreement that a woman should be able to have an abortion if she so pleases. What we don't agree on is that the pregnancy itself is "unintended," "unconsensual," or "a violation."
Your argument stirs up "The Violinist" from Judith Thomson.