me! we haven't used birth control in 5+ years and needed fertility meds to get our boys...to say we are/were shocked is an understatment! lol DH was done, and I was getting there, although in the back of my mind I felt our family just wasn't complete...guess it wasn't! lol I still have mixed feelings, mostly due to wondering how we're going to afford 3...and the 24/7 intense nausea that kicked in over the weekend isn't helping...but overall I know this baby is a true miracle and little fighter...s/he was meant to be in our family, and I already love him/her so much! I know we are incredibly blessed, although it's hard to see the forest for the trees right now :)
We're in the same situation as you! I had just recently went back on birth control "just in case" and it still happened. It seems so odd given the fact we needed fertility drugs for our girls. This will be #4 for us. Next year we will have a newborn, a 2 yr old, 4 yr old and 6 yr old.