Hi, I am 26 yrs old. My boyfriend and i do not use protection and i am not on any pills. In Janurary I had a horrible heavy period that lasted 3.5 weeks, then in Feb it came early very light for 3 days then a week later again heavy for 10 days; 13 days after it stopped i had another period in March that lasted for 10 days (light for 2 days the heavy the remainer) and now I am late and have not had my period. Post Janurary I had been normal every 28 days. I have never been pregnant before what could cause this?