What does it mean if I have a 1-3 days in the middle of my period where it is extremely light and then become heavy again like it will be heavy for 3 days then light for 1-3 then heavy for another 2 and it has been doing this for 2 years and not everytime and it never did it before also I am 17 and this started when I was 12 so it isn't new. It is so light that it is really just spotting almost