Sacha Rigby, 22, was only 18 weeks into her first pregnancy when she was rushed into hospital with contractions.
Fortunately the expectant mum from Beightmet, Bolton, received the all clear and was sent for an ultra-sound the next day to check on her unborn baby.
Mrs Rigby and husband Daniel, 31, were eager to have the early scan done so they could find out their baby's gender.
But when they showed the scan to family, the pair noticed a familiar face looking over their baby girl - their late great-grandmother May Worthington.
The mum-to-be said: "I looked at it and just thought wow.
"It is so bizarre, it is so clear. You see there's a face.
"I showed the image to my nan who doesn't believe in anything like this and she broke down in tears."
The husband and wife had previously been told it was unlikely Mrs Rigby would be able to conceive naturally, so were stunned when she found out she was pregnant.
They added they were "blown away" after noticing Mrs Worthington's face in the image.
Mrs Rigby said: "Seeing her there is the nicest feeling you can feel.
"I was told I couldn't have children and just as I was preparing for the fertility clinic I was told I was pregnant, a miracle baby.
"I'm so glad this image has been captured. It's like they are face to face giving each other a hug.
"I cannot express how much it means. I thought I couldn't have children and now I have one and have seen them together."
Mrs Worthington, a great-grandmother of four, died in March last year following a short illness.
Mrs Rigby added: "She was the most amazing woman you could ever meet, everything she did was for the family.
"I was very close to her and saw her all the time. She loved children.
"It's more comforting than anything knowing my gran is looking after my girl."