Thinking of having one more and just hiding my pregnancy

Me and my husband have 5 kids. We have been tossing around the idea of having one more. The thing is no one in our life will be supportive. We do everything ourselves. Just me and him. We don’t have a village just a lot of his judgmental family. I don’t have any outside biological family besides my dad and he would throw a fit. (It’s weird cause he only sees us on holidays) my friends may be supportive but I’m not sure and his friends could truthfully care less. I thought about having one more and just hiding our pregnancy. Has anyone did it? If so how did you do it and why?