Unknown tab appears and warns me of a virus, how can I check if someone hacked me?

I was privately browsing on safari on a very reputable site, visited by billions of people every day. All of a sudden, it froze! I couldn’t click on anything. I noticed that an unknown tab was added… Since I’m dumb and gullible, I clicked on the tab. When suddenly, it’s an unknown site, warning me of 14 detected viruses and a 76% corruption! I know the message is clearly fake and I left the site immediately. I cleared all search history, checked for unusual behaviours/ unknown apps and activated all maximum security measures on my phone. What I’m worried about is if clicking on the mystery tab left a potential virus on my phone. Again, I didn’t interact, install or call with the virus message. If I do have a virus, what could I do more and can it hack into my instagram/Facebook account? Thank you for taking the time to read and answer my questions. I’m really worried 😧!!!

[Re-Titled by Moderator]