Hi, I m 22, single, and I just became a graduate student. My periods are always like clockwork, 24 days between, 5 days long with 2.5 heavy days. However, I was 4-5 months late on my period for the first time. I was certain I wasn t pregnant, since I m still a virgin . I assumed it was due to stress . It has been very heavy for 7 days now with no sign of stopping. Just wondering if I should be worried. Thanks!