When can I get “fixed?”

H • •🌈💙12/18, 💙11/19, 🌈💗11/21, 💙5/23•💍03/13•

I’m pregnant with my second child, my husband and I don’t want anymore as this pregnancy is taking a huge toll on my body. Do I have to be a certain age or have a certain amount of kids? (Not asking for any rude comments)