a couple of raw discussions on topic...
A few women have gotten lighter periods or even completely lost their periods, (not stopped ovulation though), on 100% raw but not on cooked vegan or even high raw. It does sound like you may be under eating for your activity level, so I would think this is most likely what is effecting your periods. Here are some good things to read/watch on topic:
Hope these discussions are helpful to you! :)
Thank you for the reply!
I wouldn't overeat on nuts if I was you. Even though they are listed as having loads of calories and fat you only absorb a small portion of that because of how easily they just pass through. They are notorious for creating that bloaty food baby you're talking about. A few every once in a while is fine but I wouldn't make them a large part of my daily diet. I'd focus on getting more protein from beans and lentils instead of nuts.
Also, stop worrying about losing/maintaining a low weight. Eat healthy whole foods. It doesn't matter what number you see when you step on a scale.