How can I tell if I am depressed?

I feel that i am depressed. About 2 yrs ago I had a hysterectomy because I had uterine cancer. I was 25 when this happened. I do not have any kids, but really wanted them. YES I know adoption is one way, but I dont have the money to do that, plus i would be so scared that the parents would come and take the child. I have no energy at all. I feel like I am lost. I am married. After the hysterectomy, I lost the urge to have . I was thinking maybe that is my problem. Depression