Postpartum depression possibility

My baby is almost 3 days old, she has been non stop crying since she was born. Sometimes she cries and I just regret her so much, I wanted to be pregnant and we planned her but now I just think of her as some huge mistake... I do everything to calm her and dad helps so much but nothing ever works I’m going stir crazy and I just want to cry and shout when she screams. Is this postpartum depression or am I just absolutely terrible? Nothing soothes her, she’ll be fed with a clean bum, swaddled with a paci and she still freaks out. What can I do?