My first child but not his

I told my bf i was pregnant and i guess he didnt seem as excited as i wanted him to be. He already has 3 kids...i dont want to feel like this is "just another baby to him". I want to be able to talk about baby stuff but when i do he seems awkward and sometimes short with conversation when i talk about the baby. Im only 5 weeks and i do not want to feel alone this whole pregnancy..what should i do? :(