The 32-year-old singer shared a snap of herself lying on a stretcher following the horrific crash in LA on Monday.
She wrote: “So yesterday was a bad day. Three car pile up that we got the brunt of. My poor car written off a week before the baby is due. As is her carseat.”
Samantha was immediately flooded with well-wishes. One user wrote: “Glad to hear you and your little girl are safe Sam, you must have been terrified.”
Another added: “Luck of the Irish @samanthamumba, glad to hear all is ok.”
But Samantha was just grateful that her little girl was OK. She added: “On a more positive note God protected us all.
“After spending the night in hospital monitoring her we are just so grateful that our little girl is okay and this wasn’t any worse. Serious reality check.”
This will be Samantha’s first child with her American police officer husband Torray Scales. They married in February 2012.
Speaking previously of her desire to start a family, Samantha told the Irish Mirror: “I want to start a family, at some point. Kids are something I want.”
Samantha is currently living in LA, while she pursues an acting career.