Oh, bella!. Congratulations!
My third son was. . . oh, surprise is not really the word. Shock, perhaps. Rug-jerked-out-from-under-you, crying-in-the-bathroom, total-denial, nonoNO sort of shock, if you get my drift.
Now, I would only tell this to my closest 10,000 friends or so. We had been trying to get pregnant, and as soon as I decided (for a number of very good reasons) that getting prenant would be a horrible decision, I took a good look at the calendar, and lo! Too late.
I was so upset I didn’t tell anyone except for my husband for several months. Didn’t want to discuss it, didn’t want to think about it. Hoped terrible things would happen to me, the whole bit. It was an awful, dark time in my life, and I only wish I had known all the wonderful supportive people here at the time.
It wasn’t until my second ultrasound, at about 5 months, that I finally turned the corner–and of course, all it took was that little tiny figure on the screen, and the nurse telling me, “Looks like another boy!” I walked to the elevator and cried (with happiness–three boys! what more could a woman want?) all the way home, and after that, I was fine. 
Now, of course, he has a little sister (also a suprise, but what the heck, if you have one in diapers you may as well have two). And I wouldn’t trade this experience for the world.
It sounds like you’re getting over the shock, and I know you will do what is best for you. My surprise babies have been a balm to my soul, and I suspect this is true in many cases. Very best wishes to you and your family.
(((bella))
karol