Hello.
You might have heard it already, in january a really big database of millions of stolen accounts was discovered “Collection #1”…
If you want, you can test if your credentials are amongst them:
https://sec.hpi.de/ilc/search?lang=en
Sure, no guaranty that there are not other sources, that are in the hiding at this time, but still better than nothing…
Stay safe, change passwords regularly (mail, websites, …)