It starts in her second trimester.
Sam had a habit of leaving his gross, sweaty gym clothes on the floor of the bedroom, little damp piles littering the floor as he showered off his workout. Most of the time Rowena left them for Sam to take care of them, but her nesting tendencies had begun early, and she found herself picking up the sweat-soaked clothing to toss in the hamper.
It's unintentional, the way she brings Sam's shirt to her nose- Rowena inhales deeply, the scent of Sam's sweat like a drug right to her solar plexus. She'd always liked the way he smelled, all warm and musky, like he'd come straight from the forest. But this, his sweat and exercitation, felt like the equivalent of a shot of tequila, every bit of her warming.