What is the chance of pregnancy on taking birth control pills after unprotected sex?

Hello doctor,

I was on birth control (Aviane) for almost two years. I stopped taking the pills after my serious relationship ended before two months. My first period after my withdrawal bleed happened in the middle of last month. It lasted about two days, was somewhat heavy, but then I mostly spotted for two days. Since then, all of my periods have been the same. Somewhat heavy for two days, then light spotting for two or three days. My cervical mucus has not seemed fertile, and I have not felt any ovulation pains like before I was on birth control. Everything about my period seemed different, and I have been thinking that meant that I was not ovulating like before, but I know that might not be the case. I had unprotected sex on day 10 of my cycle. We used the pull-out method, but just to be safe, I took five orange pills (Aviane) about 12 hours later, then five more orange pills 12 hours after the first dose. Today, four days later, I am feeling mildly crampy, but I am experiencing a lot of white thick discharge. My question is, are my chances of pregnancy low considering everything? And also, if I experience a withdrawal bleed from the bc pills, when should I expect my real period again?

Thank you doctor,

Your answers certainly gave me a lot of peace of mind. It has been 19 days since I had unprotected sex and took 10 BC pills as emergency contraceptive. Yesterday and today, I have had light brown spotting and very mild cramps. My regular period would be due around the 5th of this month. Is this possibly the withdrawal bleed from the pills? Or my period trying to begin? Also, when could I test accurately for pregnancy to give myself some more peace of mind?