Hi,
I'm very sorry to hear that. You must be struggling emotionally right now, and I cannot imagine how hard that must be, especially when you have children to care for.
I'm a bit confused. Do you mean that your husband was telling you that you were pregnant again before he left? What would make him do such a thing? Were you trying for another child, or does this come as a complete surprise?
You likley have a lot going on in your mind right now, so don't be afraid to talk with people here. Really, it's a friendly and helpful community, and there are lots of moms and moms-to-be with good insights. I wish you the very best fo luck and my sincere hope that you overcome the challenges in front of you!