So I just came back from holiday abroad about two weeks ago and i haven't had my period. I usually come on either the end of the month or the 5th of every month. I also had my period whilst I was abroad as normal. I have not had sex and I'm a virgin so I can't be pregnant. I'm in my late teens. It's the first time I've been late. Can someone tell me if this is normal or if I should go check it out