Yasmin Pills and Irregularities Please Help!

One month ago, I completed a pack of Yasmin after missing 2 days within the first week. I got my period, and it was ending on a Saturday (was still somewhat bleeding). I take my pills on Tuesdays. Instead of waiting until Tuesday to re-start my pack, I began that Saturday (for extra protection) because I was going out with a guy.
We ended up rubbing against each other (no penetration), unprotectedly. Then I continued to take my new pack of pills perfectly. I finished the pack on Friday, and it is now Monday with no period, or even signs of period approaching. Did I screw up by starting my pill pack early? Am I pregnant? Is it because I started Metformin a week ago? I'm really scared!