I had my last period last oct 23, then nov 9 to 11 I had spotting. Small amount of brown blood. Then my boyfriend and I had sex last nov 17 and he pulled out before ejaculation. I'm expecting my period nov 20 but until now it hasn't come yet. Is there a possible of getting pregnant? Sorry for the poor english. I'm japanese. Thanks.

Yes. You had sex so you can get pregnant. Pulling out is not a good birth control method.