For reference:

In Britain, and presumably India: "get you knocked up" = "get your door knocked on".

In the US: "get you knocked up" = "get you pregnant".

In Britain it means get you pregnant too.

Source : I'm British

But the meaning of 'knock at your door' is also correct. As in 'knocker-uppers' https://en.wikipedia.org/wiki/Knocker-up

Well, you're a better source than I am (for Britain). Is the "knock on the door" sense still available or has it been entirely displaced?