I have been taking Yaz birth control pills (without missing any) for 17 days, consecutively. On the 18th day, I missed my pill, and then had unprotected sex. I came home and took two pills right away as it had been over 24 hours since my last dose. I took last night's pill at my normal time. There are only three more active pills left in the packet. I was wondering if I have been on Yaz long enough to prevent pregnancy, or if missing a pill could still get me pregnant even though I doubled up on pills right away.