any dread head moms out there? Please answer (long)

I want to start my dreads I'm 5wks I've been wanting to do it for a while should I wait till baby is born or start now? I'm scared the changes I may have in my hair will ruin the outcome of my dreads I've been natural for 2yrs and completely restarted growing my hair its now shoulder length , when did you start ? Post pregnancy or during? How did yours come out ? Picture please