Suggest Remedy For Delayed Periods

I am a virgin, but i have been messing around with my boyfriend for the past 2 months.Last month my period was late 5 days.This month it is late 4 days. Me and my boyfriend do now mess around anymore as I am too young. I am 16.Im am very worried that my period is late. I am having symptoms such as, fatigue, feeling sick, abdominal area is sore at times. What should I do and is there any chance that I am pregnant?