Depression maybe? Help ladies!

I'm 11 weeks pregnant and I just haven't been feeling like myself lately. I'm more than happy about having a baby and I wish the baby was here already. But, all ive been doing is crying. It's like there's an overwhelming feeling of sadness that stays with me no matter what I do. I sometimes say i just wish I could be somebody else for a day so I can be happy. Please tell me if you've experienced this or anything like it.