You poor thing, this is not the reaction anyone would expect. I think you should tell DH because the thought is only going to weigh you down and upset you more if you have to shoulder it on your own. Stay positive and focus on the good, talk to your dad and find out what was really on your mums mind at the time. Depending on your relationship with your mum, when you are feeling up to fighting the battle ask her why she feels this way and tell her how excitied you both are about your pending arrival. Don't have the answers but good luck.