What are my chances?

I was wondering if some one could help me out. My boyfriend and me do not use protection. We have been using the pull out method for about a year, and there were no worries. There was a night were after he ejaculated I was still laying on him and we were fooling around. He still had sperm on him and his penis kind of went in, it was just the tip but it still had sperm. After a while I went to0 wipe myself and there was a lot of sperm on the towel. Later on I realized that when I was laying on him, I was also laying in a puddle of sperm. I was worried but I just got my period. I looked back at my history and my previous pregnancy. I realized that the same thing happened. A couple of days after I got my period. Can it be the same thing? I need someone to help me out. It is to soon too tell if I’m pregnant, I know. I’m a heavy smoker and I don’t want too hurt my child. Are there chances of me being pregnant? Some one please