I am 17.5 weeks and still wake up on my back. From what I hear your body will correct it when it needs to. My doctor told me I have a few more weeks before I really need to be concerned about it. Now you've got me thinking about a nap!
From what I've read, if it's a problem, you'll feel unpleasant and will know to roll over. You can also put a pillow under a butt cheek (I think it's supposed to be the right one) and that will tilt you enough to prevent the problem.
Iris born Halloween 2013! 6 lbs, 1 oz, 18 inches long
Re: Back nappin'
Iris born Halloween 2013! 6 lbs, 1 oz, 18 inches long