Weird question today at my appt


I'm 37 weeks pregnant with my 4th, this same doctor delivered my last baby in 2018. Today she asked me "have you ever had problems with post partum depression?" Just the way she worded it/her tone, sounded weird. Made me kind of have a confused look. She never asked me that during my last pregnancy. Made me wonder if I did or said something to make her ask that today. Is it me, or is this odd???