I thought pregnancy was supposed to be happy?

I thought pregnancy was supposed to be happy? I’m just so sad today. My mom doesn’t support me and my pregnancy & I don’t understand why. I’m 7 weeks & 2 days. I found out last week I am pregnant. She was one of the first people to know, because I needed her pregnancy history. I’m almost 25 years old. I have my own place. Married to a great man who has a great job to provide for me & our child. I have a babysitting job from home and I’m a full time college student. The only reason she has no reason to be happy for me is because I’m in school. Why doesn’t she support me or is happy for me like the rest of my family?