I had unprotected sex in november and take unwanted 72 immediately and in december I had a normal periods and in december I had a prl test and the result show that I am not pregnant and in january I had a pregnancy test and the result show negative and in january and february I had a normal periods. But I want to another pregnancy test for better surety. Today 16 march and my periods start 19 march. When I will do pregnancy test for accurate result? Will I do when periods end? Or will I do when my next ovulation day start?