Break up!. Need help!

My husband left me 3 weeks ago and it feels like I'm going to die. We were together for almost 10 years! We have been through so much together. We had a baby but unfortunately he didn't make it. I feel like I'm losing my son all over again. My ex was the only physical part I had left of my son and now I have nothing. I feel like my world is falling apart and idk what to do.. we were planning to start trying to have a baby again in March and I asked him if he would still be willing to get me pregnant after all this and he said yes! Nothing would change between us and he wouldn't be a big part of their lives. I guess he's just doing it for me. I want another baby but is this a good idea? Will I regret it later? I'm so lost