im 19 and always had a regular 28 day cycle but the last to months its been different last month it was 37 day and this month it was 40 days i took pregancy test because i thought iwas pregant because it was so 12 days late but they were neg. then i got it after 12 days late i dont no why its been like this? no changes in my life no stress or eating changes or exercising changes so why do u think this is??? ps i havent been on birth control since nov. of 2009
Hello misunderstand your concern. Following are the cause of your problem