When on birth control I had periods with little to no cramps, and minimal back pain. I've been off the pill for 5-6 months and my periods seem to keep sooner n sooner, originally 30 day cycles and my most recent was 25 days. Cramps seem to get worse very period. This morning I started bleeding and had horrible cramps, left sided pelvic pain, and backache. I used a heating pad and took Tylenol and about 2 hours later all pain as stopped aside from minor backache. I'm currently trying to get insurance and will see a doctor as soon as I do but in the mean time should this concern me??