I'm not sure you can tell without testing. But reassure yourself you took all possible precautions. Also I can tell you when we were kids and would have sv my mom took care of us and NEVER caught it ... EVER! And she's not an emet so I doubt she took all of the same precautions.
As for not eating, please do, even if its only lite things, but try to make them healthy foods. Some emets dont eat but that actually is bad for your immune system and from what I hear dry heaving is worse than ving plus theres a very good chance you didn't catch anything.
Hope this helps and welcome to the site! Everyone here is amazing!
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Johann Wolfgang von Goethe
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