really weird periods??

[ablacketer]

Im a diva cup user, so I kinda measure my flow. Usually my first 2-3 days are 1.75 ml days (I wear it 12 hours) this period I noticed that the first day was medium flow (less than 1.75) second day was full on 1.75. yesterday (cd3) there was barely anything in the cup. If I wore a pad it would categorized as a "spotting" day. I have very little to no bleeding again today. If you look at my charts, you will see my first charting period was full 9 days including the post period spotting. then decembers period was 7 days including spotting. Looks like this one is going to make it 5 days but Im betting on closer to 3. any clues ladies???

oh and Im a very regular 7-9 day bleeder.