Nitrous oxide / Laughing Gas during dental visit?

Yomomma
I am going in for dental work on the 2nd of June however, AF is not due until the 12th.  I am wondering if it's best to forgo the laughing gas this time or if it's safe to have while I am unsure of whether or not I am even pregnant yet.  Has anyone else ever used it, is it safe?  

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