I can see where she could get postpartum depression. Everyone only thought about the baby, which is good, but I think she started to realize that she won’t be seen as Ercella anymore, but instead as a mom. Her every action would then be judged as being a mom. And someone also pointed out that the dad didn’t use to smile at her, but the second he was told that she’s pregnant, she gets a smile. Not for doing anything, but for being pregnant.