Am I Screwed?

I basically have solid stats throughout high school, solid SAT, good essays, and really good extracurriculars. However, in the first semester of my senior year of high school, I got 4 B's in 5 classes. Realistically speaking, I could have gotten only 2 B's but I slacked off. I am seriously stressing out because I don't want this last semester to ruin my chances at top schools I feel like I have a chance of getting into.

So I'm pretty much asking for Reddit's opinion on whether my first semester grades are going to ruin my entire college application.

Thanks!