My Son 22 Months Old Had Accidentally Chewed My Thyronorm

My Son 22 months old had accidentally chewed my thyronorm 100mcg tablet - single and I just took it off from his mouth. But Iam doubtful if some pieces have gone inside, Iam worried of the outcomes, Please do let me know what will be the effect of this. Should I take him to doctor. He took one tablet of which some pieces he swallowed

Devi Priya