In Katey's gender reveal, held last fall, she appeared to be showing while Katey didn't. She also appeared to have a noticable bump when she was a bridesmaid at the Reber/Keller wedding in October/November (before Smuggar's trial). For reference, Katey is due in April.
That means Lauren is right on top of her due date, or she already had this baby. The You Tuber gave her a few more months in January, so I think she was off.