| No...definitely not. Your tongue can be swollen for up to 1.5 weeks so playing a brass instrument is out of the question. Not only will it may not sound that great, but you could also cause trauma to your tongue. When you get a piercing, you are causing injury to your tongue, an open wound, and that wound needs time to heal. I suggest that you hold off on the tongue piercing until you are done with band.
I know how it is, I play the clarinet, and there was no way possible I could play it so soon after getting my tongue pierced. I would suggest to hold off on the piercing if playing an instrument is important to you. | 
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