I've been on lutera since August 2014 never missed a pill. Last month I ended up taking 2 EC the first EC I took it during the first wk of the 5th pack of the pills the second time I took it because I took advil for head. Aches, Cetirizine and 1 capsule of Vibora de Cascabel I took the capsule on December 20th seen my bf on the 26th we had sex at midnight already Saturday which was the 27th that day was also my last day of my period. I took the second EC on the 28th around 7:30pm. The day after I sated cramping since then. Also when I had my period it was during my 3rd week of the pills a week early because I had taken another EC