Does anyone else keep testing?

Polly
I got my BFP on Thursday night, and I really wasn't expecting it (I've always wanted it, just wasn't expecting it)...I tested a second time that night, then again when I woke up on Friday just to make sure both pink lines were really there... I am so tempted to run out and get more tests because I want to keep checking to make sure my baby is really there.  I know it irrational, but does anyone else feel like doing this?