Hi i had a period on the 20 of feb and i sex with boyfon triend on the 27 oon the 29f feb, and i took the pill on the 29 of feb and i took the second pill at 12 hrs later and now i have missed my period for almost 2 weeks now and i have done preg,n test and they have been neg what do i need to know, now i dont know if i could be pregnant