Honey, people often have such dreams while they are pregnant. They are a reflection of your concern for the child inside you, and the love you feel for your baby already.
The fact that the dream distressed you should tell you what you need to know - that you are a good and concerned mother already and that you are going to make a brilliant mom to your lovely new baby when it arrives.
Sometimes a dream is just a dream honey, don't pay any attention to it except to conclude what I've told you!
While I was pregnant, I had several dreams where I neglected the baby and did harm to her, but all this served to tell me was that I was concerned that I might not be the best mother I could be. I don't think anyone is perfect, but one only has to look at Naomi to know that I'm not neglecting her either!
Hope this helps
Sue