next choice pill and pregnancy symptoms a week later

my story is I had unprotected sexand decided 2 double up on my birth control as well as taking the morning after pill next choice within 24 hours 1 week later after taking next choice I am now feeling pregnancy symptoms such as tender breasts nausea, chills, slight fever. These symptoms are the same symptoms I experienced while I was pregnant with my son I have taken 3 pregnancy test that all came out negative my period is due this week now my question is could the symptoms that I am experiencingcome from taking such high dosage of hormones or is it that I am pregnant