01/23/2008 AT 05:00 PM EST
Fearless onscreen, Jessica Alba
is feeling some jitters about impending motherhood.
Alba, 26, tells Extra
that she's been having baby dreams. "[One dream] had to do with breastfeeding, which is the only thing I'm paranoid about. More than giving birth," she said.
Since becoming pregnant, which she announced in December
, Alba says she's been feeling "a lot more emotions. Anything could make me incredibly angry or break down crying. That's not something I'm used to."
As for how the svelte star, who is engaged
to boyfriend Cash Warren, is dealing with a few added pregnancy pounds, she says she maintaining a healthy diet and exercising.
"I try to eat as healthy as possible... [and] exercise. As long as I don't gain too much, too fast, that's the key."