Just found out I’m pregnant....

So me and my husband have 3 kids together 4,2, and 1. We are struggling so bad right now with him going to school and hardly working and stressing about finding a place to live. He already told me that he wanted to have another baby when we had our stuff together which I was totally for that cause I agree with 3 kids and struggling financially where can you put in another baby at the moment. Well........ I just found out that I’m pregnant and I don’t know what to say or if I even want to say anything at all till later. I need help.