Pills, sex and menstruation

It was my first time to take birth control pills and I took it on the 6th of november the day after I had unprotected sex.

I am on the trust pills which is ethynil estradiol and ferrous fumarate it basically says that it would stop the occurence of menstruation to prevent pregnancy. needless to say I missed three intakes but in irregular intervals like i missed one on the ninth day i was suppose to take it so i took two as said in the instructions, then I missed two so i took two again these occurred on my second week of taking it and now am on my third week third day and I vow not to miss it AGAIN. during those times my period hasnt started. i am usually due about 14,15,16,17 but it hasnt come so i am thinking am i safe or not? am i pregnant or not? during the time i had intercouse he did not cum inside me. to tell the truth he did not even lasts inside me for more than a minute or less. yesterday was different though he came inside me. this day was suppose to be my last day of menstruation but maybe the pills are working. please help me! Im confused and if anything will happen I would have t result in an abortion.