Period 2 weeks early. Usually pain 1st day, blood clots, kinda dark. Now no pain, bright red and no clots at all, same flow as regular. What is it?

Hormonal imbalance. Menstrual irregularities are not uncommon and anovulatory cycle is a common cause. If you miss more than two periods it would be time to see your doctor. If you do not wish to be pregnant, use contraception all the time. Consult this site for more information on this topic. Practice safe sex.