I should be happy 😔

I’m 14 weeks and 3 days pregnant with a little girl. I should be happy. And I but also I’m not. There are times when I’m up and I can buy clothes and diapers and wipes etc and be extremely happy and excited and the next minute I’m down I don’t wanna go to work or get up in the morning and my thoughts are very dark. I love baby girl and she’s such a blessing but I really don’t want to cry and feel down and depressed and suicidal anymore.