Today only, May 25th, Liz Lange Maternity Flare Jeans are only $20 Shipped as part of Target’s Daily Deal! These are normally $35. So this deal will save you about $15.00.
As far as sizing, go with your best guess. If you need to exchange for a different size, you can do so in-store with your receipt- or even return them if you don’t like the fit.