I am on a 28 day birth control pack with 4 placebo pills. Yaz to be specific. If I stop taking my pills 3 days before the placebos start, on the last week of the pack, am I at an increased risk of pregnancy (assuming I have unprotected sex during the 3 days of no pills)? My goal is to induce my period, to start a new pack, because this brand is causing horrible side effects.