depression during pregnancy:

So ladies I'm 8w1d and just feel like getting pregnant was a mistake? Like I wanted it so bad but now that it's happening I feel like I don't want it anymore. I'm suffering from severe depression and was prescribed Zoloft but I just feel wrong. I feel like a failure and scared that I won't become attached to my baby. I don't know anymore, I feel wrong. Has anyone else felt like this but everything turned out okay in the end?