On oct 25th I went to a party where I might or might not have had sex it was my first time gettig drunk(I will never do that again!) and I don't remember. I got ny period on oct . 27th it was my usual 5 day period it might have been a little lighter then usual but I didn't pay it much attention . I have a period tracker that is usually right or a day or so off . I was suppose to get my period on Nov. 22nd and it is Nov.26 and I still didn't get it . Is there any possibility that I could be pregnant if I did have sex ?