What's worse than finding a cockroach in your Big Mac? Half a cockroach. After a stressful day of moving house, Annah Sophia Stevenson decided to get takeaway from Blenheim McDonald's for herself and her three-year-old son Luca at about 5.20pm on Saturday. The cosmetic artist, from New Zealand, found that after taking three bites of her burger something was not right and then pulled a half eaten, disemboweled cockroach out of her mouth. Scroll down for video . A New Zealand woman discovered a  cockroach after taking three bites into her Big Mac burger . 'I was working on it for about three or four seconds, I thought it was a bit of gristly meat,' Ms Stevenson told the Marlborough Express. 'The guts were hanging out and it had a big hole in the middle of it.' Ms Stevenson said she was trying to work her teeth through what must of been the insect's shell. After rushing to the bathroom to vomit, Ms Stevenson brushed her teeth only to find a piece of black shell lodged between her teeth. Ms Stevenson said she was trying to work her teeth through what must of been the insect's shell . The mother of one took to her Facebook account to post the alarming discovery after her McDonald's meal . 'I just couldn't cope, it felt like every time I swallowed I was swallowing bits of it,' she said. 'The incident was like something out of Fear Factor.' Shortly after the alarming discovery, the mother of one took to her Facebook account on Saturday night to post her horrible experience. 'Thanks McDonalds Blenheim, for the cockroach Big Mac. Only thing worse than finding it, was only finding half of it (have I consumed the other part?) and it was while I was chewing on it thinking it was a bit tough so pulled it out!!!,' she wrote. 'I feel violated, ill, traumatised, and disgusted.' The post has attracted more than 300 shares and several comments from family and friends. She usually avoids fast foods as she tries to keep healthy but due to her rushed time she ordered the meal . McDonald's have organised to pick up the evidence from Ms Stevenson in order to aid their investigation . The 26-year-old has yet to contact Blenheim McDonald's as she does not want to be bombarded with complimentary food vouchers. 'I'll never, ever eat another Big Mac as long as I live,' she said. According to Fairfax, McDonald's head of communications Simon Kenny said the incident would be investigated and McDonald's will pick up what remains of the evidence from Ms Stevenson. The mother said her family usually avoids fast foods in an attempt to keep healthy but ordered the meal due to time pressure. Along with her burger, she also ordered a McNugget Happy Meal and cheeseburger for her son and an icecream sundae and apple pie.
A woman has half eaten a large cockroach after biting into her Big Mac .
Annah Sophia Stevenson's three year old son asked for a takeaway meal .
She was three bites into her meal when she noticed a strange texture .
The cosmetic artist then pulled a half eaten cockroach out of her mouth .
McDonald's will pick up the evidence in order to aid their investigation .