Being in a house with old second hand smoke

I'd like to visit my grandparents but they smoke in the house sometimes. Even if they haven't smoked in the house for 24 hours you can still smell the "old smoke" and when you leave you stink really bad. Do you think that's bad? I'm 7 weeks pregnant and paranoid. I know my sisters would visit while they were pregnant and they had healthy babies but with my history of MC it makes me nervous. What do you think? As long as it's not direct? Idk 😷 I don't want them to know I'm pregnant yet and I feel like they may get offended. Sigh

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