Postpartum snappiness?

Ok so I was told by my husband that with our first child that I was a total b!+(h during my first pregnancy. Well I’m now 4 weeks PP with our second child and I’ve noticed that any little thing just gets on my nerves like him and our 3yr old daughter playing and being loud, or any consistent noise like clicking or if my daughter keeps saying the same thing over and over. Is this part of pp depression or something to do with being pp because i wasn’t like this with my first pp experience.