Am I wrong

So I lost my baby boy the end of dec. And I got pregnant again. I'm now healthy pregnant with another boy due oct 14 I'm 20 weeks. Well am I wrong to keep thinking about my other baby inlost. His due date was June 4th 2017. This is a really hard time I'm so happy that I'm finally having my rainbow baby but i can't shake the fact and stop thinking about my little baby boy that would be here next week if not already. I'm going to go to his grave tomorrow and put flowers on it. I feel like a terrible person. :(