Period Question!!

Ashton
Okay so I've been using eve for the past year or so. My periods have consistently been about 3 or 3 and a half weeks apart. This past month though it was almost 4 weeks apart and as of now I'm waiting for it again. Is this normal?? I'm not on any birth control or anything. No real diet changes, I can't think of anything that has changed in my life, so I'm confused 🙃