The Whole30 tends to rebalance all of your hormones, hunger, sex and stress as well as the rest of them that we are less familiar with. Being late with your period despite some symptoms is pretty common. Take a read through this thread you've posted in and you'll see lots of similar comments. It's normally nothing to be concerned with but of course none of us here are medical professionals, if you are worried see your doctor.
I just finished yesterday...scale reports 19 pounds lost over the 30 days. (Yes, I have a significant amount to lose in spite of my relatively healthy eating habits and regular exercise. I have struggled with a mis-diagnosed, mis-treated thyroid-adrenal-hormone disorder for about 8 years, on top of 2 bouts of depression and 3 pregnancies. The weight has never budged with the other 100 things/treatments/meal plans/exercise/supplements I've tried. Not an ounce.)
So I'm inclined to say that, for me at least, this particular approach has finally brought some balance into my mess of a system.
I did have nuts occasionally (maybe once or twice a week) and usually one piece of fruit per day (but not every single day.) No juice at all, just water and plain tea.