You didn't abort the fetus, you need to just play clown world games like they do. By calling the action an abortion you assign intent to that.
it was trespassing on your private property after you told it three times to leave. After three warnings it was still on your private property and made no attempt to leave.
Then you stood your ground because you were in fear for your life, it was impossible to retreat because the perp was inside of you without consent.  Classic self defense case.
Somebody with a big brain and a law degree could probably figure out a clownish but legally justified argument along these lines.
That unemployed fetus didn't accept Jesus into his heart so lets be honest he was going to hell anyhow.