I've had sex with my boyfriend last night.We didn't use condoms.While he was taking his penis out of my vagina he ejacuated.He said that he ejacuated outside of me so there's no reason to worry.After that I bj him and than we had sex once more.Is there any possibility I'm pregnant ?

Once a penis is inserted into a vagina there is a risk of pregnancy whether he ejaculated or not. There is plenty of semen in the early fluids prior to ejaculation. So, yes, there is a risk you could get pregnant.

Of course you know your boyfriend has not told you the truth, perhaps he does not have correct knowledge.

The early fluids the first time plus most likely he did not get out in time if you are not sure if he was or not. The pull out seldom works.

So now you have to wait for your next period till you know for sure