Too soon to go out?

I want to go out in 2 weeks time and I have given birth 12 days ago. I've stayed in all day everyday with my baby, with no help from my baby's father and I want to go out for a little. My sister is saying it's too early and I've only just had a baby but she doesn't understand how frustrating it is being indoors all the time. And wanting to have a bit of fun. Am I wrong? Is it too early?