I suppose putting aside the moral question, what you are doing is likely to be a criminal act and if the value of the property you destroy is very considerable, I imagine you would be up for very serious criminal charges. Pleading defence of innocent life or prevention of murder unfortunately is unlikely to sway a judge who in the Anglo-American system of laws, is obliged to apply the law to the fact situation at hand; pleading that a law is unjust on itself is not a defence in the Western system of civil law. A judge is only likely to tell you with firmness that your religious beliefs, regardless of what they are, do not give you the right to violate the rights of other private citizens; if such behaviour were allowed or condoned by the courts, the result would be anarchy. Acting out of necessity is only a defence in a very narrow range of circumstances, and usually only applies to saving your own life or the lives of other human beings out of the womb.
Abortion is understandably a highly sensitive moral issue, particularly because many people believe abortion is itself a henious form of homicide. Even so, it is permitted by the law and society is not universal in agreement or assent in whether or not it should be permitted or in what circumstances it should be permitted, or even the act itself is right or wrong. But because it is contentious, it does not give people on either side of the debate the right to show contempt for existing law by committing serious criminal acts, whether they are destroying property, harassing individuals or even murdering those who take part in abortions. We all have a duty to uphold and respect the law and the rights we all have under the law, including the freedoms of other citizens. If others do not agree with us or act as we do, that doesn’t mean we have the right to disregard their private property rights, the protection the law affords their life, and also their right to freedom subject to the restraints needed for the common good. Again while acknowledging that some people regard abortion as seriously evil, someone who takes the law into their own hands is only likely to get themselves thrown into prison, and pleading their ethical or religious beliefs is unlikely to mitigate their punishment. The proper way to change the law or society then is through the democratic process.
If you feel abortion should be banned, then you have to change law through the democratic process non-violently. The law does not condone or support violence to achieve moral aims, and the courts leave law-making in response to social or ethical considerations up to the relevant democratically-elected legislature in Western systems of government. Write to your local politican, but don’t destroy property and trample on the rights of other citizens.