Should I Be Worried After Taking Emergency Contraception Twice In One Cycle Apart From Lower Abdominal Pain?

Hi, I took the emergency contraceptive twice in a cycle. First I took postpill and one week after I took postinor 2 (the two tablets at once) and my period is almost 1 week late, I have done pregnancy test twice but they both came out negative... Apart from the lower abdomen pain I felt for a day, I have not seen any other signs that my period will come... Please should be worried? Is this very serious? Should I go see a doctor?