I'm 20 years old and have irregularity in periodic cycle since my first period.( they come late usually... And I miss them also sometimes) I never took any medicines for that matter and also never had any unprotected sex. My concern raised when I was already late with my period and they became light. Flow was unusual than before. Also I didn't got any cramps. The blood was also quite brownish in colour. And next month I got the period on time but lightness in flow lasted. I also pass blood clots with the blood. What can be the possible reasons? Also tell me if any medicines are there?!