By Corrie David & Steven White A teenager was woken up in the dead of the night by her younger sibling with an urgent request – to help deliver their mum’s baby, who had no idea she was even pregnant. Nicola Thomas woke in the early hours of the Tuesday to suddenly give birth to her third child. The 36-year-old from Cardiff was aware of some discomfort during the night but put it down to her period, which she continued to have throughout her surprise pregnancy. She swallowed some paracetamol, continued with household chores like washing and put the children to bed as normal before going to sle…