It's withdrawal bleeding and is normal when you stop taking the pill. I'm on Yasmin as well, and I had lost my pills during a move and started my period in the middle of my second week.
If you believe that you could be pregnant, I would suggest taking a pregnancy test to be sure before you go back on the pill. Otherwise, I would just assume that this is a normal period due to "withdrawal" from the hormones in the pill.
Hope this helps!
-Angela
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