"To see your stomach get bigger, to feel this leg kick inside of you, and then to see the baby, it's like, 'Whoa! There's really a baby in there!' " the former America's Next Top Model winner told PEOPLE on Saturday before hosting Robi Reed's 11th annual Sunshine Beyond Summer charity event in Los Angeles.
It's not all happiness and wonder, though. Marcille, 28, agrees with fellow ANTM alum Lisa D'Amato on the subject of a pregnancy glow.
"It's bulls––––," Marcille said while lovingly rubbing her belly. "There is no glow! Your skin changes. It gets horrible … My hair is already oily, so I don't need it to get any oilier, but it is. And I don't need it to grow faster. I like my hair short."
Thankfully, she has doting boyfriend Kevin McCall on hand to keep her sane. "She makes up things to hate, because I think she looks great," McCall says.
In fact, McCall, a songwriter, is having a sympathy pregnancy.
"You know how they say that when the woman gets pregnant, the guy gets pregnant too?" Marcille asks with a laugh. "He has all of the symptoms! He sleeps all day – granted, he'll work all night – but he's exhausted during the day, and he eats my pickles and some of the weirdest things ever.
"He's definitely pregnant, but he's not getting fat! That's the only problem."
While copping to a few midnight pickle raids, the soft-spoken McCall says his role is simply to be a supportive father-to-be, no matter what it takes.
"Just being everything that I can be, and just making sure that I'm there at her beck and call whenever she needs me," he says. "If she needs popsicles in the middle of the night, then I'm going to 7-Eleven."