Jessica Alba tells us that she is making final frantic preparations for the arrival of her first baby with fiancé Cash Warren.

“I’m just trying to get my house ready before the baby comes,” Jessica explained at PEOPLE’s book party for Healthy Child Healthy World on Wednesday night. “It’s kind of hectic, it’s getting close and the house isn’t even ready yet.

Jessica explains that having time off from her acting career has been extremely healthy for her.

“I’m not working so it’s been a good place to put all my energy so it’s been a nice distraction. 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.”

One of the things that Jessica has found really challenging is taking care of her 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. 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.”