Is there a possibility I can be pregnant?

Okay... I was wondering what are the chances that I will get pregnant.. (You don't have to lecture me about birth control etc. because I know all about that stuff.) I am just curious because my boyfriend and I of 7 years are trying to conceive. I got my period on June 9th, 2010 and it ended on the 11th. We had 3 days after my period and then we did it again on the 18th. I have irregular periods so it's hard for me to actually know when I ovulate. The only thing I felt was a little twinge kind of feeling on my lower left side of my abdomen. I can't remember the exact date I felt it though. Anyone who has an answer or you've been through something similar and really got pregnant, please reply I greatly appreciate it. Any information is helpful, and I am willing to hear anything as long as you don't put rude comments on here. Thanks..!