first skipped period in 3 years. TMI

ok so first of all im 16. I started having my period when I was 10. when I first started having my period it was irregular. but I haven't missed a period or been late with my period in 3 years. I am sexually active. and I completly skipped my period this month. my boyfriend and I always use protection anytime we have sex. yes I do know that protection isn't always guarenteed to work. I don't know if this could be relevant with me skipping my period or not, but im always tired no matter how long I sleep. im always like really moody. and that's not normal for me. idk if I could be pregnant or not. what should I do? any help would be great.