I think I have postpartum depression

My baby is almost 12 weeks old and I’m so depressed. I have a lot more bad days than good days. I swing back and forth from happy to sad about ten times a day. I honestly feel like I shouldn’t have had him. I feel like the most terrible mom in the world for regretting having a baby. I love him so much. He deserves a much better mom than me.

Did anyone else feel like this after having a baby?