Hi. I m just wanting to ask about irregular periods. I m 21 and my periods as long as I can remember have always been irregular. There were times age 16 when i started where i had a normal monthly menstrual cycle. However, soon after it changed. And, recently I haven t had one for more than 6 months. The one I had before wasn t regular too but brown in colour probably due to having old blood. The doctor told me not to worry and perhaps it was due to stress because of it being my final year at university. I ve not thought about it all but it now concerns me as I m leaving for a cabin crew job. I ve looked up almost everything. Poly cystic ovaries. However, my doctor ruled that out. Now I m looking at premature ovarian failure...