My friends cat has fleas?

Please help! I recently visited an old friend of mine and brought my newborn son to her house. AFTER I'd left and we were texting, she'd mentioned that her new kitten had had fleas and she'd just got the treatment a few days prior to me being there and had prayed everything down. But I know fleas aren't quite that easy to get rid of and now I am so mortified one clung to me or my stuff and now my house will get infested as I have a cat too! What are the actual odds of that? And what should I do now? I feel incredibly stupid for going over there now and I'm so scared.