Get URL before it's redirecting to the new URL

I’m writing this script where I need to retrieve a URL from the browser.
The testcase is, I first login to the website and click a button, and after the button click, it’ll automatically open up a new page. In this new page it’s initially having a URL and instantly it’s redirecting to a new URL. However, this process happens so fast. Therefore, I can’s retrieve the firstly generated URL using following code,

driver.getCurrentUrl();

How can I slow down the redirecting process so I can retrieve the original URL?

I’m doing this because, validating the original URL is part of the test requirement.

Thanks in advance.

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