Your fingers are moveable and your skull is a non-movable joint. or a hinge joint vs a suture
Answer:
well....were ur periods regular before? if they weren't regular before then it might be normal.. bc if you just started ur period won't be every month
HOWEVER, if ur periods were normal before then there might be a problem
i answered ur other question abt this but it got deleted so i just copied and pasted my answer from before
