Getting pregnant after vasectomy doesn't really happen to people, right?

[LMNOPEE]

Snip was years ago. Like 8 years.

Am a week late. Cramps and sore boobs for 7 days now but no bloody AF.
Am starting to get concerned but it's just one of those stories from friends of friends isn't it??

I worry about this happening but my DP has it done end of 2018 and the surgeon said they way they do it now is definitely irreversable, as they take out a chunk out of the pipe rather than just snipping it so it can't grow together again.