Next Choice One Dose

I'm sexually active and on October 29 I had unprotected sex, but he withdrew. I took "Next Choice One Dose" on the next day, then on November 3rd to the 5th the pill did its job. Is this my new menstruation cycle? Two weeks later we had it again and used condom, a day or two we had it again and used condom, on both protected with condom he pulled out. Before the pill would mess up my menstruation cycle I used to have my menstruation around the 20's of each month... and since November 3rd I haven't had my period, it is now December 13th.