I would honestly doubt that you are, I only say this from experience. I stopped taking my pills around that same time (of ovulating) and I too got an early period. In fact, I got another early period the next cycle. Only 2 weeks. So, don't be surprised if that happens again. I have been thinking every month that I am pregnant for 2 cycles just because I have worse PMS off from pills than on. So, that said, just be on the lookout. You may have another short cycle, or longer....and it may be completely regular for you. Pills can really mess up your cycle until it gets completely out of your system, and that is different for everyone. Good luck!