I agree LE does not have to reveal anything at this stage about pregnancy, but they did say last week they were awaiting results to determine more charges. I don't know why they would delay, once they know (if she was) especially if that clinches it for them to seek the DP. Then the lawyer might not be as eager for a trial...
I hate to hear the defense grasp at "no motive" if she was not, or worse, make Erin out to be trying to "trap" CL. Though that would not exactly help his case either, if they indicate he knew. So they may now get far with that. They are more likely, Imo, to say he did not know, so he did not have a motive. Erin's friend can testify otherwise, (I hope) and would likely be more believable, no matter how much of a giant baby them have him resembling by trial time...