Sex on one of the 2 most fertile days using withdrawal

Me & my boyfriend always use the withdrawal method. I just took myself off of birth control like 3-4 months ago, & haven't felt any ovulation symptoms, nor have I gotten pregnant. But this month, I had my period for like 4 days, it was so painful. Then after I was completely done, I was still slightly cramping (which I assume is me ovulating, which is right now). Yesterday was my 2nd most fertile day at 22% & we used the withdrawal method like always. How likely is it for me to get pregnant now that I'm actually feeling like I'm ovulating, but he's still pulling out. & I know that pre-ejaculation is able to get me pregnant if there is left over seman in it. I was just wondering what you girls thought. Help?