Pregnancy after stillborn

I just need a little advice on how to handle the situation. So me and my boyfriend had a daughter 1/7/15, she was a stillborn😢. We both literally crumbled. Now I'm 15 weeks pregnant again and he's a wreck. He says he don't want to get hurt again. So he tries to avoid the topic at all cost. Don't get me wrong I totally understand where he's coming from but I just want to make him understand we had no control over what happened to our daughter, the umbilical cord was wrapped around her neck multiple times. How can i help him to enjoy this pregnant without him worrying so much?