I am 19, have dark brown hair, and found 2 white hairs!?

I haven't heard about anyone in my family going prematurely gray before. My mother (who has brown hair) told me she found some bright red hairs before but she never found anymore or went completely red. So, am I going gray prematurely or were those to hairs just a fluke? I have straightened my hair almost everyday for maybe the past four years but have never noticed any before. I guess I could say I'm stressed but I heard that does not actually cause grey hairs. Thanks for your help!!