Uy mama, I totally understand the worry, a few of us din nag-panic before when our periods didn't come on the expected dates! Pero honestly, ang cycle natin ay hindi always exact, kaya kahit na-miss mo yung Dec 5, 6, 7, hindi automatic na buntis ka or hindi ka buntis, maraming factors talaga like stress, diet, or just how our bodies work na month-to-month. Best move para sa peace of mind mo is mag-take ng pregnancy test or check with your OB, they can give you the real answer and ease your mind agad, alam mo na yan! Sending you hugs, this waiting period is the hardest part talaga.