Since november my period has been very irregular and very light the colour has also been different. what could this be?

Hard to say!: Lots of things can affect the menstrual cycle, inc. pregnancy, ovarian dysfunction, stress and thyroid hormone imbalance. See your doc and get this sorted out. Stop any supplements or over the counter medications that you may have started when this problem began.

Morphing Menses: Your period (menses) may be changing for internal or external reasons. Internal changes in body chemistry, stress level, diet, bacterial biome, etc. and external changes related to chemical exposures, diet, pollutants, and medications may be some factors. Pregnancy should always be ruled out first. Then look at any medications or supplements you use. Next, an exam to check for abnormalities.