Desperately need some advice!

So i just found out im pregnant again at 5 months postpartum, i am in total shock as ive been on birth control. I have 3 children and one step son. I just don’t no how to feel right now. Ive planned all of my pregnancies and it took me a long time to fall with my most recent baby. We live comfortably although ideally we need a bigger house but we have made this house work. Im married and husband has a half decent job but i just cant shake this terrified feeling… how are we going to make this all work, we don’t have enough space, i wouldnt be able to go back to work, the list goes on. Feel so bad that i have somehow managed to get myself in this situation xx