I Just Found Out I Am Pregnant And I Work

I just found out I am pregnant and I work for a home health agency. I have to visit a home 2xmonth for 60min where I am exposed to third hand smoke (no one is smoking in the home while I am there however I can still kind of smell it probably coming from the couches and carpet). My question is, because I am only in this environment twice a month am I okay or do you feel like this is a serious health hazard I am exposed my unborn baby to?