Me and my boyfriend are not trying to get pregnant. But not really preventing it either. He "pulls out" 😕

I had two periods in November and none since. Boyfriend says I can't be pregnant because of his method.. But the only times in my life that my periods were late was when I was pregnant. I also asked boyfriend if it turns out that I am pregnant would he think I was pregnant by someone else (only said that to see how sure he was about his method) and he couldn't say anything. Well anyway he's bringing a test when he gets off work. I'm so nervous. I really think I'm pregnant but I don't get pregnant easy so I'll be shocked if a little slip up did the job.