Might Not be Decaf.

I asked my husband to bring me a large decaf iced coffee from Dunkin this morning. 
I can tell the difference between regular and decaf pretty well, so when I tasted it I became suspicious.
He specified to the manager (who was making the coffee) that it had to be decaf because I'm pregnant. Manager said three times he made sure it was. 
Am I just being paranoid? And if it isn't decaf, I just drank like 300mg of caffeine. What should I do?