Sometimes this whole parenting lark makes me miss my depression. Back then I could spend all day every day lounging around in bed drinking coke, eating chocolate & crisps, watching daytime TV & sleeping whenever I felt like it. Bliss! Y'know, if you ignore the bits where I couldn't get out of bed or scared myself by thinking about how easy it would be to disappear under the water in the bath...!
Being a parent isn't easy & it's certainly not always fun! It's terrifying being responsible for another human being & constantly worrying that you're teaching them the wrong thing or that you're not preparing them well enough for the outside world or that you'll take your eyes off them for a second & they'll spontaneously combust...
But...
There'll be times when it's the best thing in the world. They look so proud of themselves when they first take a few steps & you'll be the one they want to celebrate their achievements with. It'll be you who they'll run to when they're scared/upset/hurting & they'll cling to you like you can make everything better with just a hug. You'll get to run around madly & hang them upside down by their ankles & you'll be the only one who knows how to tickle them in just the right spot for maximum giggles! 
Parenting really is the most wonderful/scariest rollercoaster. I really do think that the first few months with your first is the worst. They get so much more entertaining when they can interact a little more & so much easier when they can be left with some toys to entertain themselves!
Go easy on yourself. Take it one day, or just one hour, at a time. Figure out what you need. As long as you can fit in feeding/changing around whatever you need to do she'll be fine! Don't worry about the housework. Eat easy things, or let your DH cook. Don't bother getting dressed if you don't feel like it. Forget about going out unless you feel you need a change. Look after yourself first. Don't tell kitty but routines can come later. DS1 didn't have a bedtime until he was at least 9 months & then it was only because he was grumpy at about the same time every day! It was more a case of us noticing his routine than setting it! He still goes to bed later than most of his peers but then he'll sleep in in the mornings. It works for us. Figure out what works for you & ignore the babies who can do backflips or recite the complete works of Shakespeare by 2 weeks old. No-one will care when they first rolled over once they start school. It won't matter when they learnt to walk or talk when they're doing their A levels & employers won't be interested in how early they could count to 10... Unless you plan on getting her a job in a circus side-show as "The Amazing Counting Baby"! 
(Yy to bring though, if you do feel consistently low/hopeless you might want to consider the possibility of PND. It's scary to admit when you're not coping but with depression it's best to identify & tackle it early!)
Have some
&
& a little
& plenty of
&
& look after yourself!