My last cycle i had an extra long period its usually only 4 days but i had unprotected sex the weekend i was ovulating and im not on birthcontrol i keep thinking i have cramps and im gonna start but i dont i do kinda have an irregular period and i got over a mild yeast infection ( would that effect my period?) and i might just be overreacting a little because my sister just found out she was pregnant at what point should i take a pregnancy test?