"I'm just trying to get my house ready before the baby comes," Alba, 26, said Wednesday night at PEOPLE's book party for Healthy Child Healthy World author Christopher Gavigan. "It's kind of hectic, it's getting close and the house isn't even ready yet."
With Alba taking time off from acting, she's handling the bulk of the duties to get ready for baby, which Alba revealed recently is a girl.
"I'm not working so it's been a good place to put all my energy so it's been a nice distraction," she said at the event at Lucques restaurant in West Hollywood.
"I'm used to having to be somewhere all the time, and it's kind of the first time in my life where I really haven't been working in a while, and now it's just about the baby being healthy, the house being ready, and nesting, it's really different. It's cool – I feel like I'm fully absorbing the whole experience.
She hasn't been too busy to think about wedding plans – "How could you not!" she says – but Alba's keeping mum on the details.
Meanwhile, in between nesting, Alba is keeping an eye on her pre-natal diet.
"I have to make sure that I'm eating more of the right nutrients and vitamins, but I'm not used to eating this much," she says. "I've had to take time out of the day to eat before I get cranky and rundown and tired. Before I was just like the energizer bunny."