Fisher and Underwood welcomed their second child — a son named Jacob Bryan Fisher on Monday, Jan. 21

After years of trying, Carrie Underwood and Mike Fisher have welcomed their miracle baby — Jacob Bryan Fisher.

Underwood, 35, who is already mom to son Isaiah Michael, 3, with Fisher, 38, announced the news on Wednesday, revealing little Jacob was born on Monday, Jan. 21.

“They are just so beyond overjoyed with their healthy baby,” a source tells PEOPLE.

“It has been a rough few years with the miscarriages and the accident and they didn’t even know if they’d get to this point.”

“They’re feeling truly blessed,” the source added.

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Carrie Underwood/Instagram

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Mike Fisher and son Jacob. Carrie Underwood/Instagram

Shortly after Underwood shared Jacob’s birth announcement, which included photos of the newborn from the hospital, Fisher shared a celebratory post of his own and touched on their tough journey.

“Jacob Bryan Fisher! You are a gift from our Lord! The last few years has had its challenges and it makes this moment even more sweet,” Fisher captioned an Instagram photo, which shows baby Jacob nuzzled on his chest.

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Mike Fisher with sons Isaiah and Jacob.Carrie Underwood/Instagram

“We didn’t know if Izzy would ever have another sibling but we learned through it all that God is in control and his timing is perfect.”

“He is good all the time even in the difficult times that are hard to understand,” Fisher wrote adding the hashtags “#grateful” and “#miraclebaby.”

Jacob’s birth came nine months after Underwood received 40 to 50 stitches in her face and underwent surgery on her broken wrist after a November 2017 fall on the steps of her Nashville home.

In addition, she revealed she suffered three miscarriages from 2017 to 2018. During an emotional interview with CBS Sunday Morning in September, she opened up about her challenging fertility struggles.

Explaining her reaction to the heartbreak, the “blessed” star said, “My son, Isaiah, is the sweetest thing. And he’s the best thing in the world. And I’m like, ‘If we can never have any other kids, that’s okay, because he’s amazing.’”