Not excited

I have a dilemma. I have a one and a half year old who is at times a handful, like most are. He is my world and I love him to pieces. I am also almost halfway through my second pregnancy. It wasn't planned and was a surprise to us. I cannot seem to get excited about it. With my son, I was so excited and couldn't wait for him to arrive. We recently found out the sex of our new baby and I thought that would help bring out some excitement in me. We found out it's a girl, which I wanted. I do want this baby and I want it to be healthy, I just don't know why I am feeling so down. Maybe hormones, but since finding out, I cannot stop crying and feel so easily frustrated. I am also annoyed with my husband who I asked to help me do a reveal photo with my son. My son wasn't interested and made my husband frustrated so I told him if he didn't want to help then just say so and let me alone to do it. So then he walked away. I really don't even want to speak to him. Just needed to let out some steam ...