During my second week of this pill pack I accidentally took two pills in one day. After that I kept taking one pill a day till I finished the pack, which resulted me not taking a pill on the last day before my placebo week. A few days after I doubled up, I started experiencing breakthrough bleeding, and it lasted all the way till the day when I'm supposed be getting my period (yesterday). However now I don't have bleeding at all. I had sex a few times during this, should I worry about getting pregnant? I'm on Balziva 0.4-35 MG-MCG.