I have always had irregular periods pretty much my whole life. My period would usually last about 3 weeks to even a month sometimes. I started taking birth control in November, the first month of taking bc my period lasted about the same (3 weeks). The second month my period lasted 10 days (Jan 11-20) I started my new pack 2 days later..(Jan 22) so i didn't take birth control during those 2 days. i started week 1 of bc and i took just one a day since i pretty much knew i wouldn't be seeing my bf and didn't think of taking 2 a day to replace the ones i didn't take. Well long story short, we ended up having unprotected intercourse yesterday..(4 days after I started the new pack)  he didn't cum inside me.. what would be my chances of getting pregnant with my whole history of irregular periods??