Do not judge please! Help What do I do??

Lucy
Would like too start off with me and my partner do NOT smoke inside or anywhere near the house or leave our child alone. 
I must of brought in a dimp on my shoe, my nearly 11 month old came over too me and was chewing something as they do and I put my fingers in his mouth and pulled out a used filter tip, he was coughing as well afterwards and was sick a bit, he didn't swallow it and must of only had it in his mouth for about 5-10 seconds, what do I do? Do I just keep an eye on him or should I run him up too the doctors too have him checked over? What should I watch out for? I feel like such a terrible parent 😭