Question about PP belly wrap...?

So I'm going to buy one from WinkShapewear.com.... Anyone ever use one from there? They are kinda pricey but my tail bone and ribs are out of place so the doctor said one would help after I deliver, particularly immediately after, and advised me to buy one now.
But my question is about size. The one I'm choosing is slightly adjustable, but you still need the correct size. It says if you are still pregnant to measure around your hip, right below your belly.... But it never says how far along you should be or anything. And the small size cuts off at 35in, and the medium is for 35.5 in and up. Last week I measured and I was 34 inches, so I was about to buy the small, but this week I'm almost 36 in because the baby dropped. So do I go with a medium?? I just don't know. I can't afford to buy the wrong size and get another, so I just need advice. I'm 39 weeks and pre pregnancy 105 and 5 feet.

I would go with the medium.

Does the medium say how small it goes? You were so tiny before pregnancy, I almost think the small would be better.

You and your husband are super adorable, btw  

<blockquote><b>Quoting SpaceCowgirl:</b>" Does the medium say how small it goes? You were so tiny before pregnancy, I almost think the small would be better. You and your husband are super adorable, btw  "</blockquote>

Yeah I just looked again, I'm retarded or blind... Actually 34 and smaller is Xsmall which I will avoid. 34.5-36.5 is small and 36.5-39 is medium. I think I'll just go with the small. I just grew cause baby dropped, and my tail bone is actually pretruding from my back. So by putting that into place that will help to fit snug into a small. And it is adjustable by 3 different clasps on the side.
Did you ever use one?
Lol, thank you by the way  

<blockquote><b>Quoting Baby Brooklyn coming soon:</b>" <blockquote><b>Quoting SpaceCowgirl:</b>" Does the medium say how small it goes? You ... [snip!] ... snug into a small. And it is adjustable by 3 different clasps on the side. Did you ever use one? Lol, thank you by the way  "</blockquote>

I used one because I had c-sections and it was a God send. It made recovery so much easier. I don't think it really helped much in to get me back to my pre pregnancy size any faster, but that could be because of the c-sections too.