Heyy, I am 15 and I have been suffering from the same problem. I also have not had sex, but have fooled around with lads. You cannot be pregnant sweetie becasue you have ot had intercause. You will most likely be upset about your parents and therefore it is showing itself by you not havind a period. But if you are that worried darlen, go to the doctors. take a friend with you, I did. They may take a blood test if they think it is necerssary, but don't be concered if they do.
My parents are not going through a divorce but I have not had my period in about 2-3 months. I have not suffered from any stress as I have been on my holidays most off the time. I have also recently gained 9pounds too, which has made me rather worried because I don't know if they are linked. Please help!