my blog hacked?

I started https://www.antinertia.com recently and all worked fine.
A friend typed the link to my blog on Google the other day and realized that the search result was displaying some nasty text and ads that I most definitely did not put there! ??

Anyway, can anyone help me out? I have no idea how to remove that, or find out how it was done (as far as my knowledge goes, I can’t find any suspicious code on my WP pages)…

Anything I can do, without loosing my content? Any tips on finding the culprit-code?
Thanks….