Pp depression

How long are doctor's worried about you getting pp depression. I'm not even sure if I have pp depression or if it's just my depression acting up in general. Can other people bring on pp depression? I'm 3 weeks pp with my 3 week old daughter and my boyfriend is a great dad he helps out with her feeds her changes her diaper make sure she's doing ok spends time with her and it's great. And I generally thought I was doing ok besides that fact that I'm home for maternity leave. Which sounds weird that bothers me but I never really liked being at home all the time I like going to work but I also love being at home with my daughter I just feel so lonely. It just seems like ever since the baby my boyfriend doesn't really want anything to do with me. He tells me he loves me and gives me kisses but it just seems like he always either sleep, help taking care of the baby, or with the boys. I just feel like ever since I gave birth I kinda be forgotten about and it's making me feel really lonely and I noticed when when we first came home I was fine my depression was up my anxiety wasn't up but now it just feels like I have a huge weight on my shoulders now of depression and I don't know if it's pp or just in general my depression because I love spending time with my daughter I love taking care of her but on the inside I just feel so alone and sad.