Maci had been travelling with six-year-old Bentley over the weekend when their Jeep flipped over on the road and did three rolls.
Luckily, neither Maci nor Bentley suffered serious injury.
The 23-year-old reality star shared four scary looking photographs from the scene of the accident to Instagram, saying she was thankful her son and unborn child are okay.
"Thanking God that Bentley and I were able to walk away from this nightmare with only a few bruises. "Thanking God that my unborn baby girl is perfectly healthy after this," she said.
Maci also said she was thankful they'd all been wearing seatbelts or the outcome could have been worse.
"Thanks to everyone that stopped to help, that was huge. I pray everyone else involved is doing okay. #jeepwrangler #rolledthreetimes #terrifying #totaled #notmyfault."
Maci announced last month that she and boyfriend Taylor McKinney are expecting their first child together, saying it was a "huge shock" but they are excited.
Her first son, Bentley, is fathered by ex-boyfriend Ryan Edwards.
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!