See this is the problem with you and your twisted sense of rationale. With people thinking like this damns this world for their own selfish morals.
The one acting without selfish moral here is you.
You are priviledging the HYPOTHESIS of a human being (A foetus that doesn't feel and doesn't think)
OVER the real life and choices of a woman.
The one who is a problem is not me here.
Again, it doesn't act in any different way than when it is wanted.
What you don't understand is that the act of parasitizing comes socially with the notion of the lack of consent when we are talking about the action.
So yes. When unwanted, the foetus acts (from the point of view of the bearer) as a parazite. It's LITERALY what it is from their point of you.
But I get that you don't care about that since you take the point of view of women into account in this situation.