I'm just about to go out and buy the test - have not told DH of my suspicions yet and I am swinging from excited to petrified.
On one hand, I think it will be lovely for my DD to have a sis or bro close in age (12 months between me and my sis) when they are older, but am dreading the practical issues of managing a newborn with a one year old . If the test is +ive and all goes well, I reckon the due date will be 10 days after my DD's birthday.