Can someone please help me out with this?

Last week, I noticed just one or two grey hair strands, and I didn’t think much of it. But now there are clearly more, around five or six and I have no idea how that happened. Is this normal? Has anyone else dealt with something like this? Should I be worried or see a doctor?

Additional info: I’m 25F, I don’t smoke or drink, I eat pretty clean, I'm vegetarian, and I work out regularly. I’ve been traveling a lot lately tho, so maybe that’s related? Any advice would really help.