I have had more than one period in a month?

I'm 16. I had my period before I went on holiday to Spain but it went away the day I left on the Sunday, I arrived home the following Sunday not having a period and then the Monday after the Sunday I arrived home my period came back, I don't know if this is normal? I amen't ually active and this is the first time this is happened. I don't know if I should go to see a doctor (Which I amen't too keen on the idea) but I hate having them. Can anyone help me? :( Thanks.