I don't know about you, but a couple sips of water would not be enough to push a pill through my wrap...not when I was first healing, not now.
My guess is that the wrap stopped the pill, and that it was coughed up by you...maybe even in your sleep.
Can you crush the pill, or at least cut it into smaller portions? You definitely will need more than a couple sips of water to get it through that nice tight wrap. Just think, though...if it's hard to get it through, it'll be great at keeping that acid in your stomach.
Hope you're having a great night!