Possible PP depression?

Not even sure if it is but I'm always a happy person, pregnancy was amazing but ever since my princess was born his family has given me so much drama especially his mom and I've felt disrespected so many times and I feel he lets her get away with it and so much has happend in these past 4 months that I just start crying out of nowhere, if he even says something like he is mad I want to cry... and when I think of everything that has happend I cry... it's like im so sensitive lately nd im having mixed feelings... could this be pp depression?