If not a joke - as long as you've switched off the gas and it isn't pouring in to your house you're fine. It smells foul but you would need a lot to harm you and only when you are harmed would the baby be.
First time mum so don't know about these things. I just reassessed the situation after moment of panic wore off and realised someone must have accidentally not noticed they had left it on as it was on lowest setting.
There was no flame so I assumed gas must have been leaking out.
Thanks for the help, I know it sounds silly, just honestly freaked out there as I don't know that much about Carbon Monoxide poisoning etc..
Ah I see - first time mum panic. Second and third time mums panic too - but about different stuff
Carbon monoxide poisoning is always an emergency but especially when you're pregnant because your baby's blood is even more receptive to carbon monoxide than yours is and the baby will get sicker quicker than you would - so it is something to worry about if occasion arises. However as everybody else has said carbon monoxide is not a worry for you in this case. Do you have a carbon monoxide detector - might be an idea?