Yes they do. The first two books are more geared towards younger kids because of Harry's age and relatability. As Harry gets older, the books get a lot darker and more mature. Hell, even the 2nd book is significantly more dark than the first one (there's actually death in it!)
I certainly wasn't advocating forcing Bella to have an abortion, I just think it's messed up to have the heroine of a book series targeted to teenage girls choose to not have an abortion despite people telling her that she WILL die if she doesn't get an abortion. It glorifies anti choice thought and basically turns Bella into a martyr for that movement. Maybe I'm reading too much into it, that's definitely a possibility. A lot of people seem to think that this kind of stuff doesn't influence people, but it does. It's just very subtle and a lot of people don't realize that they're being influenced. I mean hell, even Disney movies are guilty of that! Pretty much the only Disney movies where the heroine is a strong female and doesn't give up something vital to be with her man are Mulan and Beauty and the Beast. You don't think they have an impact on influencing kids to think that relationships work a certain way? I'm pretty sure they do.
I actually do have Twilight in my Netflix queue right now. I'll be honest, I am curious. Maybe one of these days when I have some free time I'll borrow the books from my younger sister and give them an honest chance so I can form a genuine opinion of my own that's fair. We'll see.