So, these will do the trick of Prego panties, but I marked down a star because even following their chart the ones I got are tight...as in hope my child birthing sized hips and oversized bum don't get larger tight. My suggestion is to order bigger than you thought you'd need unless you enjoy tight undies. I prefer mine to be able to breath a bit.
Also, these do sit really really low as another leg bootied person stated. Overall I do think they will last and that they will work for my purpose, but I wish I'd gone up a size.