As Kelly Graves settled in for her 12-week scan, she was told her twins appeared slightly different in size.
But after being assured it was probably nothing to worry about, the 33-year-old mum thought nothing further of it.
She headed back home with her husband Bill, 35, and kids Phoebe, 10, Florence, eight and Albert, five and waited for her next scan. But at 16 weeks, she started to worry.