Thinking about a fourth

I deal with disabilities involving my ankles, knees, hips, low back, arthritis, fibromyalgia, Hashimoto’s thyroiditis, PTSD, and have dealt with PPA and PPD. We have two beautiful girls and a handsome son. I’m over the moon and completely adore them. I cannot help the feeling that my family is not complete yet. We have the space in our home and our vehicle. My OB sees no reason why I should not be able to have another baby, but my mom and one of my sisters has expressed concern about how moody I get during pregnancy. I was not previously medicated, and I am now in on going therapy to deal with it. I’m very stable from a mood standpoint. I’ve never been medicated for my fibromyalgia due to nursing and pregnancy, so I am good with coping with pain. I’m 34, and I don’t want to wait to long, especially since my first three are all so close together in age. My husband is not quite ready yet, but he is open to having a fourth. He’s an amazing dad and helps a ton when he’s home. Clearly, you do not know all the details of my situation, but do you think there is anything wrong with having a fourth with these issues? I care for my children fine, on my own, all day.