Shes worried about how an abortion would affect her mental health (this is a huge concern for her because of some medical issues she has) and that abortion can reduce fertility later in life for some people. She doesnt think she could do adoption because she doesnt think she would be able to give it up, even if she knew it was best for the child.
What really sucks for her is that she just lost her virginity to this guy, and the conception likely happened then.