5 weeks Pregnant

Elyssa
Hi I'm Elly I'm 17 years old and will be 18 this upcoming January. On Tuesday I learned I was pregnant and my grandma was there with me and both her and my grandfather are very supportive. (I live with them and my mom and brother are in CA). I'm a senior in high school and I have a boyfriend who is the baby's dad and I learned I was 5 weeks pregnant yesterday. I've talked to him about it and all he wants to do is have an abortion because he doesn't think it's the right time and that he loves it and all but he doesn't want a kid right now and I'm torn because my plan was to wait until my 20s and have a kid but I think it'll kill me if I have an abortion. I don't know what to do and my grandma and I are calling my mom tonight to tell her. My boyfriend basically bases teenage pregnancy off of teen mom and other crap like that and I think it's ridiculous and I already love this baby inside of me and I really don't think I can get rid of it. I have my first ultrasound next week when I'll be 6 weeks and he and my grandma are coming with me. Is there any way I could change his mind? He says that I'm being selfish and that he wants this baby but it's not the right time and that he'll give me more later but this just feels right.. I don't know, but I'm super emotional so like every time he even brings it up I start balling my eyes out. But can someone help me.. Or give me some advice..? Teen pregnancy can't be that bad right? I mean yeah it's going to be a lot of work by if you put your mind to it, it works right? I just don't know if I can get rid of this baby. 
Thanks,
Elly