Career or sibling for my son

paula
I been struggling making a decision of either having another baby or going for Nursing for my career. My son is the only child but I don't want him to not know whats it like to have a brother or a sister especially because I came from a big family. But I really want to give him a better future and I'm really craving getting my school done to be a Nurse . My son is 6 now and I really don't want my children to be too far apart. ; ( idk.....