Pregnant and depressed?

So I'm currently 9weeks pregnant. So for the last 3 weeks I been crying none stop. EVERY little thing makes me sad or want to cry. I cry every day  and I don't want to cry. I feel like I'm harming my baby by doing it but there isn't anything that I can do that makes me feel better... All I need to do is cry. I don't know what to do everyone round me is getting fustraide. My mom thinks I'm crazy and don't care about my baby. My boyfriend thinks the same thing. But I can't help it. I've never in my life been this emotional. Help?