So very emotional

Me and my husband have a 3 year old girl. Well we have been trying for a year and couple months now. Today we have go into a argument about another child and he said he doesn't know if he really wants the 4 year difference. I started to cry bc I didnt know what to think or say to him. Right now our living situation is with my parents and I hope soon we can get a home. But with him saying that idk if I should go back to the doctor and get my tubes tried or what. I'm just really upset.