I get this error "This url may be deleted from our database soon...", but my website is fine! Why is this?

This means that last time UrlTrends tried to connect to your website, it was down, or returning an error.

You may want to investigate the reliability of your server. If you think the downtime was a once-off, to make sure UrlTrends checks it again soon, register for an account and add it to your watchlist.