Have not had breast tenderness for the last 3 menstrual cycles. now two weeks before expected period i do. what does this mean?

Estrogen effect: It is estrogen hormone effect of your cycle. It dominates the first half of the cycle. All bets are off regarding any sign as a sign of pregnancy 2 week before expected period because the placenta is not fully formed yet and does not secrete pregnancy hormone. If it was one week or 5 days before you could have thought that if it is because of pregnancy but not 2 weeks before expected period.