Advice on abnormal early periods!!!

Kati
My period has always been very regular.... long story short I had a period everything was normal then I had a period a week earlier than normal and after that second period it was a week and I have started to bleed and clot like normal period how ever I don't believe this is a normal period. Everything seems so abnormal for me to have my super early periods. I've never been on birth control or anything. I'm left puzzled and would like anyone who has any idea to please share