Help please!

So my boyfriend and I haven't had sex in a while. So yesterday we decided that it would be a good time to do so. We had sex we are currently using the withdrawal method. He did come. But not inside me. We went to dinner, and then came back home and had sex again. What are my chances of getting pregnant from his precum?

My question is have any of you gotten pregnant from this. Or does anybody know how high my chances are of getting pregnant?

According to Glow my ovulation spiked on the 5th of this month.

UPDATE:

So we are currently not trying but are not trying to avoid it either. I know you can get pregnant by having sex. I know what birth control is. I know that the withdrawal method is not the best. I just wanted to see if any of you guys have gotten pregnant like this.