Hi, I Had My Period On The 16th To 20th

Hi, I had my period on the 16th to 20th of February, had sex with my boyfriend on 22nd with CD nd another one without any on the 24th of February nd then immediately used prostinor2 (the two tablets at once),I bled the 10th day after my period which was on March 1st nd 2nd, and nw I am expecting my period, it didn't nt show up for last month (march)nw in first week of April, I am bothered cos I dnt knw wats wrong.