Consider:

> *Thank God (it wasn't any worse)!*
>
> [Thank God](http://idioms.thefreedictionary.com/thank+God): *(spoken)* be pleased or happy: *Thank God no one was in the way or on the sidewalk when the bus went out of control*

Or

> *[**Thankfully**](http://www.oxforddictionaries.com/words/adverbs) (it wasn't any worse)!*
>
> [thankfully](http://dictionary.reference.com/browse/thankfully): *(Informal)* fortunately: *Thankfully she wasn't injured*


Or

> *Phew(, it could have been worse)!*
>
> [Phew](http://www.urbandictionary.com/define.php?term=phew): used to express relief

Or

> *Am I ever lucky!*

Or

> *Lucky me!* (can also be meant sarcastically depending on context)

Or

> *Lucky me -- and lucky you, too! (Here's the money)*

Or

> *All's well that ends well!*

Or

> *Thankfully, it looked worse than it actually is!*