I have had 8 babies now and never had diarrhea before going into labor. I have heard it can be common but not always true for sure. As for nesting...my biggest thing has always been to have the baby's bed/linens, clothes, etc. all washed before baby comes. Sometimes I would want to do more but always remind myself that some things can actually wait but the less I have to worry about when the baby arrives (having to do w/ the baby), the better because finding the time later is more challenging w/ a newborn.
Anyway, some myths may turn out to be true for you and some may not. Like Lilseamoney said...it really is a guessing game for everyone.
I've been nesting for a while and I'm 33+5, the diarrhea thing is true but it doesn't always happen to everyone. It's a guessing game really :/
The lose bowls are pretty true but your body can prepare for labor prrty early . and the same for nesting . I was nesting at 30 weeks . but this is my 3rd baby so I may go threw things a tad earlier