Becky is pregnant for real real not for play play.
Since the speaker has added this expression, the listener can not mistake that Becky is pregnant because only by lying about her pregnancy would the statement be considered play play. Since Becky really is pregnant, this is for real real and can not be a lie or joke.
This is the way how you show that you actually mean something, that it is true. If someone can't say for real, for real on God then it means that it is not actually legit.
Do you love me?
Yes
Really?
For real, for real on God
Are you mad?
No
For real, for real on God?
*silence*