My husband accidentally turned wrong hob on and pack up box had began to melt with heavy smoke. My initial reaction was to get him to get pack upbox outside. However he shut door and the room I was in with my son smelt very chemically. I took my little boy and dog into garden for fresh air. He was struggling to get melted plastic off hob. I went into help. Could feel the chemicals in my throat. I did what i needed to do with oven and sat outside. I'm 18 weeks pregnant and I am now worried I may have caused unborn child problems.