Sooo I'm not pregnant, I've taken 2 test.

I was meant to get my period a week or so ago and she has not arrived.

I'm getting a little concerned now, is this something to worry about ?

I recently became a vegetarian a month ago and on top of that I don't eat much maybe a meal a day ( don't preach to me about how bad that is, I know it's bad ) could diet be a problem ? Should I see my GP