Christian faith and contraception

Hi, I wanted to ask a question on this website since it’s about Christian values. I am not a Christian, but my boyfriend is a Christian. I respect that and don’t have anything against it, I’m not against Christianity. My boyfriend won’t use a condom when we have sex. He says it is against Christianity, but I don’t understand that. I know that Christianity is against abortion, but condoms don’t take any life. We try to make sure that we don’t have sex about the time of my ovulation. I’m very afraid of getting pregnant, but he just says if it happens then that’s just part of life. He says that it’s MY choice to take the risk of getting pregnant when I have sex with him, but I think he also has some of the responsibility. I can’t use the contraceptive pill for medical reasons. I know he’s really against abortion and he would probably never talk to me again if I had one. We are only 16 and 17, and we’ve been together for four years. He says that his mother was 18 when she got married, and that we can also get married if I get pregnant. You have to be 18 to get married, don’t you? I almost feel that he wants me to get pregnant, when he doesn’t use a condom. This is a pity as he often initiates sex. I’m afraid that his parents would blame me if I got pregnant, they think their son is perfect and they would think I had seduced him. Is the Bible against using condoms? Is the Bible for sex? Should I respect his choice and just get pregnant if we aren’t careful enough?