Macbook beeping noise

Hey so i got this macbook nearly a year ago now; i initially got it for school work ect but started playing roblox on it. Unexpectedly it worked great, ive been playing it on this macbook for pretty much the amount of time ive had it but something wierd started happening today. I was playing as normal and my charger was in, then occasionally the macbook started making this wierd high pitched screech type noise. Im not sure about this however its only happened when i've had my volume up, dont know if this is coincidental or if it is part of the problem. It also seems to occur more often when i have my charger in. Im kinda worried and idk what this is. I've looked this up everywhere but cant find anyone witht he same problem and id just like to know whats going on.