Please Help!! Took Plan b on High fertility days.Pregnant?

I had sex with my boyfriend durriing according to my ovulation calendar on high fertility days.  according to my calculations i was supposed to ovulate aug 7th.  i had sex on aug 4th annnd on the 5th. i took the morning after pill 40 hours later after  i had sex on the 5th.   i had unprotected sex and both times he came inside me.   on aug the 8th i spotted for three days straight.  then the spotting lstopped.  i was supposed to get my period on august 22 but its today september 4th annd still no period.   the only thing i have been noticing is that ive been getting heavier discharge then usual every single day.  please help i am reallly worrried.  could i be pregnant??????