delayed period.

i had my last period october 19th it stopped october 23.

i had intercourse november 4 & again november 6th. no insemination on the 4th but on the 6th so i took a plan b same day on the 6th a couple hours after .. my period was supposed to be here november 14th but no period.

i took a pregnancy test on the 13th just because i was so anxious it was negative, took 2 pregnancy test on the 14th the actual day i was supposed to get my period they both were negative, i am now 4 days late .. should i wait a couple more days to retest again or could this delay be from the pill? comments??