Question: If something unexpected (and incredibly unlikely) happens, should we take it as something deeper or just a fact of life?

Something highly unlikely and very positive happened at a very bad and negative point in my life, this event arguably showed a very different future to the one I imagined.

Don't know how to read into it, or how my actions should be after the event, should I embrace the change?

Answer: 
In the [Sivaka Sutta (SN36.21)](https://www.accesstoinsight.org/tipitaka/sn/sn36/sn36.021.than.html), the Buddha explains that not all experiences are caused by kamma. Sometimes, it's just the weather or something else that's not extraordinarily significant. Not everything happens for a reason.

> 
> As he was sitting there, he said to the Blessed One, "Master Gotama,
>  there are some brahmans & contemplatives who are of this doctrine,
>  this view: Whatever an individual feels — pleasure, pain,
>  neither-pleasure-nor-pain — is entirely caused by what was done
>  before. Now what does Master Gotama say to that?"
> 
> 
> [The Buddha:] "There are cases where some feelings arise based on
>  bile. You yourself should know how some feelings arise based on
>  bile. Even the world is agreed on how some feelings arise based on
>  bile. So any brahmans & contemplatives who are of the doctrine & view
>  that whatever an individual feels — pleasure, pain,
>  neither-pleasure-nor-pain — is entirely caused by what was done before
>  — slip past what they themselves know, slip past what is agreed on by
>  the world. Therefore I say that those brahmans & contemplatives are
>  wrong."
> 
> 
> "There are cases where some feelings arise based on phlegm... based on
>  internal winds... based on a combination of bodily humors... from the
>  change of the seasons... from uneven care of the body... from harsh
>  treatment... from the result of kamma. You yourself should know how
>  some feelings arise from the result of kamma. Even the world is agreed
>  on how some feelings arise from the result of kamma. So any brahmans &
>  contemplatives who are of the doctrine & view that whatever an
>  individual feels — pleasure, pain, neither pleasure-nor-pain — is
>  entirely caused by what was done before — slip past what they
>  themselves know, slip past what is agreed on by the world. Therefore I
>  say that those brahmans & contemplatives are wrong."
> 
> 
>
In general, of course, unlikely events are accidental. And physical events, such as an earthquake, are always accidental. But, if an event, such as meeting someone seemingly by accident, is caused by somebody making decisions, it is remotely possible that karma may be involved. Old friends for previous lifetimes sometimes seek one another out by unconsciously making the right decisions that lead to an “accidental” meeting. Such events are rare. And, when they do occur, there is usually supporting evidence, such as finding one another very familiar in the case of a meeting of old friends. I would suggest that you look for substantial evidence before “embracing” such an event, especially if it requires significant cost or sacrifice.