ur wrong, a fetus isnt a parasite, even if its not an independent organism yet, it doesnt mean that its a parasite.
Parasite:
1. an organism that lives on or in an organism, known as the host, from the body of which it obtains nutriment.
A fetus is a parasite. Not a person. Even if it is considered a person for some reason,
2. a person who receives support, advantage, or the like, from another or others without giving any useful or proper return, as one who lives on the hospitality of others.
Yup, still a parasite.