My Son Is 1 Year Old Today. He Weighs 31lbs

my son is 1 year old today. he weighs 31lbs and im not sure how tall he is. He swallowed 200mg tablet of ibuprofen I gaged him and he threw it back up. it was mostly dissolved. but im not sure if he swallowed any more there were only a few in the bottle to begin with. an it looks like only one or two are missing. I gaged him a few times but nothing else came up. what should I do? and what simptons should I look for? I gave him a bottle of milk and some bread. its been 20 minutes and he seems fine but im terrified.