IPhone 6s random beeping noise?

So I'm on my phone at around midnight, I believe I was on ifunny, and randomly out of nowhere i hear two, fast, loud, high pitched beeps through my earbuds. I have never heard this sound before and it's definitely not any iOS notification sound. This kind of scared me half to death, being alone in a dark room at the middle of the night, I d really like to know why it happened

No, it the sound didn't come from ifunny. What I was doing wasn't an important detail but whatever, I still wrote it

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