Does my boyfriend really love me? Will he still love me after I have our baby?

I'm due next month with a boy and I turned 18 last December. I started dating my boyfriend in September and got pregnant in mid October. My family (especially mom) are very unhappy that I'm pregnant especially since I was only with my boyfriend a couple weeks before I had sex with him. I know it was stupid but I wasn't thinking "gee Louise you could get pregnant!" and I should have been. Darren (my bf) is the only guy I've ever been with. He makes me feel so happy and loved. I never felt as though my family accepted me or loved me so I have some issues with them. He gave me affection and love that I've never gotten from anyone and that's why I fell for him so quickly. When I told him I was pregnant, he was okay with it and promised to be there for the baby. My family wanted me to get him out of my life and give the baby away but I decided that I wanted to keep this child and I moved into his house (his house not his parent's house) 2 months ago. I still talk to my mom and dad but we're not quite there yet, I guess. Darren is so good to me. He goes out of his way to do nice things for me and he makes me feel good about myself. I love him and our son more than anything but I'm scared. We haven't known each other that long and I'm afraid that he's only being nice to me because of the baby. Like he loves me because of our son, not because of me and I'm scared that he'll change and not want to be with me anymore once he's born. He says that he loves me and will always love me and wants to marry me but how can I know if he REALLY loves me?