A first timer dad feeling curious..

Hi, Just feeling curious, do pregnant womens had their sense of smelling changed? im Dad wannabe, im a Light Smoker, i used to smoke at home, but eversince my wife is pregnant, i've been smoking at the ground floor smoking zone.. Before headed back home, i will eat some sweet to freshen up my breath. Right after im back home, my wife said she can smell a smoked cigarette so strong. Do Air purifier helps? *sorry, this is my first experience.