Hi Aurora. There could be many reasons why you may have gone 40 days or more with out a period(mens). Stress, weight issues such as sudden gains or losses, or you cycle may simply be changing due to coming off the pills. Pregnancy is unlikely since you used birth control and you had a full period afterwards, but it is a remote possibility. You could try waiting one more cycle to see how it goes, or you could check with a doctor and see what he/she advises. Good luck.