Not wanting children.

Ok so I never actually wanted kids. I got pregnant on the pill and decided to keep my baby. I then got the IUD, and we also used the pill out method to back it up. I am now pregnant again!  I feel terrible cause I know my husband only wanted one, and I didn't want any. Although I love my little boy to death and will love this one to death, obviously. We have good jobs and can afford a chikd but just didn't want another at all. Has anyone else been in this situation? How did things go? We only have a two bedroom home but do have extra rooms downstairs but do not like the feeling of having to put my 2 year old downstairs or keeping my 2 year old and newborn upstairs while we sleep downstairs. 
-not trying to hurt anyone's feelings who are having a hard time TTC. I know it would be difficult to hear this.