No. I'm pretty confident that the "not wanted" statement was made in reference to the biological parents.
p(parents are generous/caring/loving | parents are the type of person to adopt a child) > p(parents are generous/caring/loving | parents bring pregnancy to term)
In addition, for adopted parents, we know that both parents want the child. Whereas with birth parents, we know that the mother wanted a child but we do not know if the father did.
I can think of many situations where this wouldn't be the case. Poor women in states with restricted access to abortion (requiring multiple visits to a clinic that's hundreds of miles away for example); women trapped in controlling relationships where leaving could be physically risky; teens who get pregnant for socially immature reasons and end up not wanting the child.
So are you saying that, despite the effort, time, and money it takes for adoption, your adoptive parents didn't want you?
That doesn't make any sense.
While it might be true that your birth parent(s) didn't want you, there might be reasons why that is so; of course, I can't speak to that as I don't know your situation.
What I can say, though, is that my parents wanted me when I was adopted. I can't really say why my birth mother (let alone whoever my father is/was) gave me up for adoption (what I was told as a child, doesn't sit completely right with me as an adult - I'll never know the truth, though - and that's ok). But I do know that my adoptive parents spent a lot of time and money to keep me (I was a foster child before that, at 2 years of age). That and the rest of my life growing up makes me know that I was wanted.
Perhaps I'm just misinterpreting what you wrote; if so, I apologize.