is this something I should be worried about?

I recently got off the pill mid october and then had my first period off the pill on the 15th of November! I was due for my next period on the 12th of December, but I still haven't gotten my period. I took a pregnancy test on the 17th and it was negative. I just don't know if this is normal after coming off the pill or if I should take another test? 

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