Hi, I'm a 18 year old college student and been taking Junel Fe for the past 6 months. For the past 6 months, my periods has been coming on the week I don't take my pills because my supply is only 21 days where the next week will allow for my period to start. One month it could be heavy, the next could be very light, or does't have anything at all and varies in length of days when it stops. My boyfriend and I do have unprotected sex and my period has not yet come on the second day where my period should start. Should I be concerned?