 [ Symptoms ] i am 20 and i have missed a period is that normal  my period is usually irregular  once in 9th grade i missed it for 3 months i will be 20 next week and i have missed my period this month the first week of april i did a lot of workexercise that i do not usually do but i have not done it since then also about three weeks ago i completely cut caffeine from my diet cold turkey also i am a virgin i have never done anything sexual [ Disease ] hi i think like before its just skipped period and this could be from this extra work load you have been doing and including the exercise if your not getting any pains or any other signs just see how it goes do hope this helps good luck