You may have suffered from depression if you feel depressed, tired and powerless for an extended period, and have lost your appetite even for things that you usually think to do. Then you may need help to feel better. Most people get better already after a few weeks with the right treatment.
It is common to become depressed during pregnancy or when you have just become a parent. For some, the depression becomes a depression. Then you feel bad for a long time. There is treatment to help with depression. The earlier you seek help, the faster you can feel better.