What are my chances of being pregnant?

[deeplymissable]

I was on birth control (Aviane) for almost two years. I stopped taking the pill after my serious relationship ended in January. My first period after my withdrawal bleed happened in mid-February. 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 hasn't seemed fertile, and I haven't felt any ovulation pains like before I was on birth control. Everything about my period seemed different, and I've been thinking that meant that I wasn't 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, 18 days after the unprotected sex, I have VERY light brown discharge, but I did have protected sex yesterday and bled afterward, so it could be from that? 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? Before this, I would've expected my period May 3rd-5th