September 20, 2016 08:00 AM

Molly Sims admits she struggled with weight gain during her pregnancy, as well as thyroid issues that went undiagnosed.

“No one tells you what’s going to happen,” Sims says to a group of celebrity moms, including Haylie Duff, Garcelle Beauvais and  Soleil Moon Frye, who got together for PEOPLE’s Mom Talk video series, which is now live on PEOPLE/Entertainment Weekly Network.

“With my first pregnancy, I ended up gaining 85 lbs. and had a bad thyroid problem that no one diagnosed throughout the whole pregnancy until four months later,” Sims, who is pregnant with her third child, adds.

Watch full episodes of PEOPLE’s Mom Talk now at People/Entertainment Weekly Network. It’s free, and it’s available on streaming devices, including Apple TV, Roku, etc. Just download the PEN app on your Smart TV, mobile and Web devices, or you can check it out at people.com/PEN.

Erica Hampton

Sims, 43, who is already mom to Scarlett May, 17 months, and Brooks Alan, 4, says that during her pregnancy she had false hopes that the weight would just fall off after she gave birth.

“Sometimes, deep down, when you’re eating that Sweet Lady Jane on the 405, you think, ‘It’ll come off when I have the baby,’ ” she says.

“There’s also a lot of pressure to bounce back,” Beauvais, 48, adds. “You know who I love is Drew Barrymore! She says, ‘It took me nine months to have ’em, I don’t care how long it takes me to get it off.’ “

— Sheila Cosgrove Baylis

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