i had a period on the 20 of feb, had sex on the 27 of feb and he finished inside and i bought the next choice pill until the 28 of feb and took it until 29 at 1am, but the same time i took it we had sex again twice and he finished inside also and then i took the second pill at 1pm that afternoon, well my period was suppose to come on the 18 of march and i have symptoms of my period, cramping, breast hurt, have discharge, but no period yet, i had a preg test and its neg, what could it be now, im nervous, please tell me