I am 18 years old and not sexually active so i know i am not pregnant. I usually have a 31-32 day cycle and my period came on the 14th of Dec last month. It is now the 17th of Jan and no sign of period and on day 34 of my cycle. Not sure if i am ovulating i had quite a bit of clear/whitish discharge yesterday and slight menstural cramps and my breasts are tender and sore to the touch which usually happens before i start my period. I started my period 4 years ago and thought i was getting into a regular cycle but it seems my cycle is irregular. I am slightly worried. i know stress falls into this and i have been feeling slight stress with college and work but it still worries me. Are late/irregular periods normal at 18? Would also like to add i am very slim built and 5"3.