Hi there, I'm having big doubts that you're pregnant! If you are a virgin then it is very unlikely that you're pregnant! If no one ever touched you down there even with hands then it seems to me that chances of being pregnant are zero so don't be so scared. Try to calm down. If you're thinking that you're pregnant you should feel other symptoms as well. It is true that a missed period is a sign of pregnancy, but there's a lot more of early signs and symptoms of being pregnant such as back pain, tender breasts, morning sickness, bloating or over crappy feeling and many more. Let me tell you that if you're still a teenager then you period cycles are still going to be abnormal and very weird from time to time. Believe me that you're not the first and definitely not the last teenager who's having messed up periods. I would recommend you not to worry about that so much because, seriously, you have nothing to worry at all. I can give you an example my situation when I was an year older than you, when I was 16 years old I went four months without a period for no reason at all but I knew that something like this can happen because I talked to girls older than me and then later I talked to my mother too and I recommend you to do the same. I assure you that you will feel better when you're going to talk to your mother because she can explain you all the details you need to know. Moreover I can tell you that sometimes something like this can happen even when you get into adulthood and trust me this is something absolutely normal. Your cycles aren't yet regular, you're still young. I hope that everything is going to be fine. Good luck and best wishes