Good luck card to congratulate me with my wedding? Is this an insult?

My wife and I married a few weeks ago and this one card we received is bugging me slightly. I have no clue how to interpretate it.

It has a ladybug with clovers on the front and says: Good luck! Now I swear this card is meant for people that are about to enter competitions, start a new job or something similair. But maybe my card etiquette is not up to date. So can any of you enlighten me how to see this card?

Yes very random question lol