Pregnant without ejaculation?

So basically about 2 weeks ago i had sex with my boyfriend without protection. He cummed but im not sure if it was inside me or not. He told me he pulled out. Today i found out im pregnant. Hes the only guy ive slept with and im sure it was from that time because he lives far away and we dont really have sex a lot. I told him im pregnant and he said that it cant be his because he pulled out. I know, thats terrible to say but he was genuinely confused. I dont know if hes lying or not. Help please

Update: i mean like do yall think it was from pre cum? Or is he lying that he didnt cum inside me?