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Stephen Hawking Just Stated That There Is No Way To Measure Events Before The Big Bang Because They Simply Are Not Defined. This Is Because, The Laws Of Physics And Time Did Not Measurably Exist Before The Big Bang. In Other Words, Time Began At The Big Bang. The Big Bang Happened 13.7 Bya.

Stephen Hawking Says He Knows What Happened Before the Big Bang

https://www.livescience.com/61914-stephen-hawking-neil-degrasse-tyson-beginning-of-time.html

Stephen Hawking recently explained what he thinks happened before the Big Bang.