Maybe baby #2?

So I’ve been a sahm for over a year now with our son and some people I know are having babies. Our son is over a year now still nurses and my husband and I have been talking about having another. Our son is so sweet and smart but I’m worried if we do if he’ll get jealous or what if I don’t have time for him anymore. I want them close in age but now I’m wondering if I should even have anymore kids. I absolutely love my son. I just don’t want him to feel left out or anything but I don’t know if I’m done having babies either. Any advice?