Hair started growing on my upper arms out of nowhere after I shaved any fixes?

I’m kinda confused and a little stressed. My upper arms used to look basically hairless and A while ago I shaved them for no reason and now it feels like hair is growing there out of nowhere and it’s way more noticeable.

Did shaving make it grow back thicker or darker, or am I just overthinking it? I kinda regret shaving and don’t know what to do now. Should I keep shaving, leave it alone, or try something else?