hi, my bf and i had unprotected sex on the 24th, i took 4nordette pills as EC on the 27th following up after12hrs, then we had it again on the 30th and then i took an EC the day after, and until now 11th of december, i dont have my period. my last was on the 6th of november, is it the side effect of taking the pills as EC twice the same week or could i be pregnant?