Postpartum depression

It has been a week since I had my baby boy. He’s beautiful and I love him but I have been feeling so depressed, it is hard to connect with him, I’m tired all of time and my doctor put me on zoloft to help. I feel like the worst mother in the world. Does this feeling ever get better? Should I do something else besides take Zoloft? I never leave the house because of how tired I am... my husband watches him while I nap during the day.