I am so disappointed.

So me and my husband have been trying for our 4th baby. We started about 8 months ago and finally this month (last week I got a positive pregnancy test.) Well I asked him to come home he asked me why I told him I was pregnant and he responded with okay I'll be home. When he got home he looked and me have a slight smile and said "I'm excited" with all of our other children when we found our he was ecstatic having tears and jumping picking me up twirling me around kissing no me touching my and this one he just barely smiled and said I'm excited. We have been trying for a while and I know it was unexpected because we were trying for what seems alike and eternity but we also had tried for about the same amount of time for out last child and he was behind thrilled he hasn't displayed no emotion this time I've talked to him he has he will try to show more emotion but it's haunting me that he's not happy and not excited and it's making dislike this pregnancy so much. (please no rude comments I'm really needing support I cried for the last week since I found out).