Oh thank you both so much for your replies!! I definitely feel better!
But I also have been doing more poking around, and I think there is something wrong with my Adsense ads, and this might be part of what they were talking about. All my ads are small, condensed and overlapping in some cases. They were just fine the other day, but now every single one is weird and small!
I re-downloaded a new code from Adsense, and it looks a little different, and it fixed the problem... it was back to normal on that one page that I tested it on. So I wonder if there was some issue with a Wordpress update that made the ads go weird? But why would the coding be different?
I have another old website (not on Wordpress) that has had the same Adsense ads there for years, and they still look perfectly fine.
Sorry to ramble on so much... just trying to figure out what might have happened, since I'm so clueless about a lot of this stuff, and something definitely seems to be weird with my ads.
Thanks again for your replies!! :)