Is this post pardum depression?

I'm a single mom and live with my family that are very supportive and helpful. I have my daughter almost 2 weeks ago and have been so happy but since she hit a week old I just feel like I don't really have any feelings like I'm not happy anymore.. I cry sometimes for no reason or just thinking about how I feel so alone I just feel like I have no feelings at all and just not excited about being a mom like I was the first week.. Should I get seen by a doctor? Or is this normal and will go away?