Gender blood test and ultrasound

Briana
Just wondering how many mommies did the blood test around 12 weeks to find out gender. It will only cost us $25 and our doctor told us it takes a week to get the results. Just wondering if it will actually only take a week or will be waiting longer? And if y'all are glad you did and how accurate it is? Also wondering about how far along you have to be to do the 4d sneak peek gender reveal? Thanks!