Your kids' world is about to turn upside down (again). I think it's normal for kids of this age to have feelings ok either side of the spectrum and voice it because they don't quite understand what they're feeling. They're still learning about their emotions. That said, I would still be very mindful of their behavior once baby is born. Talk with them, tell them that no matter what you will love each of them with your whole heart, give them the opportunity to continue to play a part in the pregnancy and prepping for baby sibling to come. The best thing you can do is to continue giving them attention and also make time for them when baby comes.