I didn't feel any joy in general- just flat all the time. I could see my DD1 was cute and I loved her. But it all felt like so much hard work.
Now I know that when I start to feel overwhelmed, I need DH to take DC out so I can rest, sort out my stuff, read a book, etc.
I know a PP said it gets easier as they get older. That's so true. DD1 is now 8 and youngest is 3. But some of it isn't just their ages- I used to feel like doing anything was like wading through treacle and lost my temper easily and shouted at them far more than I liked.
They still drive me crackers at times. It I know that if I'm starting to feel hassled and my anxiety levels are rising, I need to take time for myself so my anxiety can dissipate.
I had PND with my first 2. Not no3, but diagnosed with mild depression when No3 was about 18 months. So this has probably always been part of me but that pre DC I managed it (somehow).
I'm no medic, but I would say that if there are more bad days than good, it might be an idea to see your GP. And "bad day" can just mean "blah"- I never had thoughts of self harm or harming my DC. It was all just so much hard work.