So strange that you chose right now to post this!! On Tuesday I was having the EXACT SAME THOUGHTS!!!
Right now, my life is exactly where I want/need for it to be--a healthy little boy and a baby on the way. Good husband, secure job with GREAT benefits and pay, and FINALLY getting all my bills paid to the point where I have money left over PLUS saving toward our land/house.
Well, when is the bottom going to fall out? Yep, it scares me, too when things are so good!!
I'm trying to look at it like this, though: maybe all this GOOD stuff now is a reward for all the year I spent struggling trying to get here. Maybe instead of the bottom falling out, I spent all that time laying a FIRM foundation.