Replying to A spider just crawled into my macbook. What do I do?

I was sitting at my desk using my laptop, and saw a spider sitting on it near the edge by the screen. I grabbed a tissue to use to kill it, but hesitated because I didn't want spider guts on my macbook. It then proceeded to crawl down into one of the vents that are in between the screen pivot bar and the base of the laptop. What now? Do I leave it alone and hope that it will crawl out? Am I supposed to go on living the rest of my life not knowing whether or not it's still in there, and if a flock of baby spiders will emerge? Guys pls