November 26, 2013 11:00 AM

Dimitrios Kambouris/Getty

For Megan Fox, the nose knows — especially when she’s pregnant.

The actress — who is currently expecting her second child with husband Brian Austin Green — is the new face of Avon’s Instinct fragrance and admits much of her sudden sensitivity to smells is due to her baby on the way.

“I can smell everything! I usually can smell foul scents, I pick them up from far away,” Fox, who is also working on Avon Foundation for Women’s global social media campaign, #SeeTheSigns campaign, which will educate the public on recognizing signs of domestic violence, tells PEOPLE.

“[Brian’s] constantly saying, ‘I don’t smell that, you are crazy, that’s not in the house,’ and I’m saying, ‘I promise you, it is somewhere.'”

While her second pregnancy has been “easier,” there is one new milestone for the mom-to-be: preparing the couple’s 14-month-old son Noah Shannon to be a big brother.

“We are trying to explain it to him and I always say, ‘The baby is going to say, “Wah, wah, wah,”‘ because he is not communicating yet [so] I’m not sure how much he understands,” Fox, 27, explains. “I know as far as everything else goes, he’s really aware. So I think he has an idea, but I don’t think he understands that a baby will be living with us all of the time — that will be an adjustment.”

But until his younger sibling arrives, the toddler has been busy soaking up time in the spotlight. “He loves to be the center of attention and I also think he is a really sensitive child,” Fox says.

“I think that he’s going to be a nurturer. It’s a lot to expect, but he’s only 14 months now. I think he’s going to be an amazing big brother with time.”

Adds Green, “He is either going to be great or … he’s going to be completely against it and it will be a battle.”

— Anya Leon with reporting by Emily Strohm

Video Flashback: Megan Fox’s Changing Looks

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