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Here in BFE, Hermiston, OR, the local constabulary has me listed as a carb-head (hop head too, but that's slightly different) so take that into consideration when I say: [there's no such thing as "overcarbed"].
I never carbonate more than 2.7 volumes, ever. It's just not worth the risk of gushers or explosions, and who wants a beer that pours >50% foam?!
I accidentally carbed to 4.5 volumes in some old natty boh bombers. They survived just fine, so I'd imagine you're fine. There was enough pressure for the caps to dome over though.
You need to pop one open. I like my dubbels a bit more on the effervescent side.