When Tracey Ferrin fell pregnant with her second child she was determined to remain as active as possible.
Keeping up her regular volleyball games, she did her best to keep moving - but a niggling pain in her leg began to trouble her.
But the expectant mother from Texas, who was already mum to baby Elly, was just 18 at the time and the picture of health, so she wasn’t too concerned the pain was serious.
