Does your essay have to take a position on the issue, or are you just presenting facts? You are not really clear.
I am opposed to elective abortion, so I will offer you some pre-writing thesis ideas based on my personal viewpoints on the issue. Others that are pro-abortion can offer some opposing ideas and then you can choose which one you think you would like to write about. I have volunteered with women in a crisis pregnancy center and I have learned through my experience that there is a lot of guilt associated with abortions. Young women do not think about this when they first come in -- they just want the abortion -- but those that do choose to have an abortion don't just breezily walk away afterwards. Sometimes the guilt lasts a lifetime.
Many young women choose abortion because they think it is a quick fix for a difficult situation. One survey indicated that of women who have had abortions, 63% felt "forced" into it by others -- either a family member, the father, medical personnel, parenting organizations, etc. In this same survey, 74% of the women said they would not have the abortion again, but would choose other options, such as adoption or keeping the baby. Religious reasons aside, this is a very painful decision for a young woman and to tell women that it is "a simple medical procedure" is a half-truth that totally ignores the emotions of women.
So, some thesis statements could be:
Terminating a pregnancy often causes guilty feelings that can last a lifetime.
Aborting a baby is not an easy decision.
Aborting a baby takes away the rights of the unborn child.
I know this is a controversial topic and many people will not agree with my views, but you have to decide what to write for yourself.