What Causes A Bad In My Mouth?

Hello. So this might just be me being paranoid, but it s kinda bothering me so i thought i might as well try this. So i was eating ice cream earlier, using a small plastic spoon. When i was done i walked around with the plastic spoon in my mouth for maybe 30 mins. It s been about 10-11 hours since then now, and i still kinda have a weird taste in my mouth. And all the way down my throat. It remains even after eating, and brushing my teeth. It doesn t sound like a big deal, but it s kind of unsettling.