Dylan Dreyeris about to be even more outnumbered in her family of four!

“He continues to grow healthy and strong each day and yes,it’s another little boy, whichwe are all so excited about,” Dreyer tells PEOPLE.

The star, who confirmed her pregnancy Wednesday onToday, also revealed she’s thrilled at the prospect of a little brother for 2½-year-old sonCalvin Bradley.

Brian Fichera (L) and Dylan Dreyer with son Calvin.Courtesy Dylan Dreyer

Dylan dreyer, Brian and son calvin

She and Fichera were preparing to begin in vitro fertilization when they learned the happy news that she was pregnant once again.

Dylan Dreyer.Nathan Congleton/NBC/NBCU Photo Bank via Getty

Dylan Dreyer

“We couldn’t believe it!” says Dreyer, who had to undergo surgery to remove extensive scarring from heremergency cesarean section delivery ofCalvin.

“I do thank God for [Dr. David Reichmanof the Cornell Center for Reproductive Medicine] because I know the surgery he did … made a huge difference,” she adds. “Obviously it did. But I also think my prayers were answered.”

Sylvain Gaboury/Patrick McMullan/Getty Images

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RELATED VIDEO: Dylan Dreyer Gets Candid About Nursing and Why She Felt She Let Her Son Down

Dreyer was unaware of it at the time, but she was already pregnant when shewent public with her strugglesin April.

“[Al Roker] did figure it out beforehand,” she tells PEOPLE. “It’s funny because he was the first to knowwhen I was pregnant with Calvin, too. He said to me, ‘I just have an inkling.’ ”

Dreyerpreviously told PEOPLEin May that she was nervous to go public with her difficulties in conceiving for a second time as she feared criticism.

“Going into it, I thought I was going to get a little bit of negative pushback — kind of like, ‘Well, you already have a son, so be happy for what you have,’ ” she said. “So I went into it with those expectations to get a little bit of blowback.”

After sharing her story, though, Dreyer said she was grateful she did, as ithelped to “open up a conversation”among women experiencing similar struggles.

For more from Dylan Dreyer, pick up the latest issue ofPEOPLE, on newsstands Friday.

source: people.com