me and my boyfriend had unprotected sex it's only in a very short time and this is my first time and my period didnt come yet but normally my period not come in a same day its come like this month 28 next month 16 and next month 8...like this so i cant know my period will come on this month but last month my period came 2 times first its about 1st another time is 27th. i will pregnant? i'm very scare please help me.