Smoke alarm went off once 40 minutes ago and hasn’t gone off since?

It’s a brand new smoke detector, I just installed it last week, so there’s no way it’s old or out of batteries. It beeped three times 40 minutes ago, and I checked everywhere for warmth or smoke but found nothing. Am I safe? If there was a fire, even a hidden electrical fire in the walls, then the smoke detector... show more It’s a brand new smoke detector, I just installed it last week, so there’s no way it’s old or out of batteries. It beeped three times 40 minutes ago, and I checked everywhere for warmth or smoke but found nothing. Am I safe? If there was a fire, even a hidden electrical fire in the walls, then the smoke detector would go off more than once...right? I’m an extremely paranoid person. :(
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